Hello libcode-seafire-protocol

.editorconfig

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+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+indent_size = 4
+max_line_length = off
+trim_trailing_whitespace = false
+
+[*.yaml]
+indent_size = 2

.gitattributes

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+* text=auto

.gitea/workflows/on-push.yaml

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+name: on-push
+on: [push]
+
+jobs:
+  build-and-test:
+    runs-on: linux
+    container: code.helloryan.se/infra/buildenv/cxx-amd64-fedora-40:latest
+    volumes:
+      - /build
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v3
+      - name: Authenticate
+        run: |
+          git config unset http.https://code.helloryan.se/.extraheader
+          echo "${{ secrets.NETRC }}" >> ~/.netrc
+      - name: Initialize
+        run: |
+          bpkg create -d /build cc config.cc.coptions="-Wall -Werror"
+          bdep init -A /build
+      - name: Build
+        run: b
+      - name: Test
+        run: b test

.gitignore

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+.bdep/
+Doxyfile
+
+# Local default options files.
+#
+.build2/local/
+
+# Compiler/linker output.
+#
+*.d
+*.t
+*.i
+*.i.*
+*.ii
+*.ii.*
+*.o
+*.obj
+*.gcm
+*.pcm
+*.ifc
+*.so
+*.dylib
+*.dll
+*.a
+*.lib
+*.exp
+*.pdb
+*.ilk
+*.exe
+*.exe.dlls/
+*.exe.manifest
+*.pc

LICENSE

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+Copyright © 2024 Ryan. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+
+3. All advertising materials mentioning features or use of this software must
+   display the following acknowledgement:
+
+       This product includes software developed by Ryan, http://helloryan.se/.
+
+4. Neither the name(s) of the copyright holder(s) nor the names of its
+   contributors may be used to endorse or promote products derived from this
+   software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY COPYRIGHT HOLDER "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+NO EVENT SHALL COPYRIGHT HOLDER BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

README.md

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+# libcode-seafire-protocol
+
+![Build status](https://code.helloryan.se/code/libcode-seafire-protocol/actions/workflows/on-push.yaml/badge.svg)
+
+## Requirements
+
+None, other than a modern C++-compiler.
+
+## Building
+
+See the wiki, https://code.helloryan.se/code/wiki/wiki/Build-Instructions, for
+build instructions.
+
+## Contact
+
+Please report bugs and issues by sending an e-mail to: ryan@helloryan.se.
+
+## Contributing
+
+Please send an e-mail to ryan@helloryan.se to request an account and
+write-access to the libcode-seafire-protocol repository.

build/.gitignore

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+/config.build
+/root/
+/bootstrap/
+build/

build/bootstrap.build

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+project = libcode-seafire-protocol
+
+using version
+using config
+using test
+using install
+using dist

build/export.build

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+$out_root/
+{
+  include code/seafire/protocol/
+}
+
+export $out_root/code/seafire/protocol/$import.target

build/root.build

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+# Uncomment to suppress warnings coming from external libraries.
+#
+#cxx.internal.scope = current
+
+cxx.std = latest
+
+using cxx
+
+hxx{*}: extension = hxx
+ixx{*}: extension = ixx
+txx{*}: extension = txx
+cxx{*}: extension = cxx
+
+# The test target for cross-testing (running tests under Wine, etc).
+#
+test.target = $cxx.target

buildfile

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+./: {code/ tests/} doc{README.md} legal{LICENSE} manifest
+
+# Don't install tests.
+#
+tests/: install = false

code/seafire/protocol/.gitignore

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+# Generated version header.
+#
+version.hxx
+
+# Unit test executables and Testscript output directories
+# (can be symlinks).
+#
+*.test
+test-*.test

code/seafire/protocol/basic-parser.hxx

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+#ifndef code__seafire__protocol__basic_parser_hxx_
+#define code__seafire__protocol__basic_parser_hxx_
+
+#include <code/seafire/protocol/error.hxx>
+#include <code/seafire/protocol/grammar.hxx>
+#include <code/seafire/protocol/message.hxx>
+#include <code/seafire/protocol/protocol-version.hxx>
+#include <code/seafire/protocol/request.hxx>
+#include <code/seafire/protocol/response.hxx>
+
+#include <code/uri/uri.hxx>
+
+#include <stdexcept>
+#include <vector>
+
+namespace code::seafire::protocol
+{
+
+  /// Implements a basic HTTP message parser.
+  ///
+  template<typename Iterator>
+  class basic_parser_t {
+  public:
+    /// Holds an iterator pair.
+    ///
+    struct iterator_pair_t
+    {
+      Iterator first;
+      Iterator last;
+    };
+
+    /// Holds iterator pairs for a header/value.
+    ///
+    struct header_t
+    {
+      iterator_pair_t field;
+      iterator_pair_t value;
+    };
+
+    /// Attempt to parse a message.
+    ///
+    Iterator
+    parse(Iterator, Iterator, std::error_code&);
+
+    iterator_pair_t const&
+    version() const
+    {
+      return version_;
+    }
+
+    std::vector<header_t> const&
+    headers() const
+    {
+      return headers_;
+    }
+
+  protected:
+    enum expectation_t
+    {
+      // Requests.
+      //
+      expect_method_start = 10,
+      expect_method,
+
+      expect_target_start = 20,
+      expect_target,
+
+      expect_version_h = 30,
+      expect_version_ht,
+      expect_version_htt,
+      expect_version_http,
+      expect_version_slash,
+      expect_version_major,
+      expect_version_period,
+      expect_version_minor,
+      expect_version_cr,
+      expect_version_lf,
+
+      // Response
+      //
+      expect_response_version_h,
+      expect_response_version_ht,
+      expect_response_version_htt,
+      expect_response_version_http,
+      expect_response_version_slash,
+      expect_response_version_major,
+      expect_response_version_period,
+      expect_response_version_minor,
+      expect_response_version_space,
+
+      expect_response_status_1,
+      expect_response_status_2,
+      expect_response_status_3,
+      expect_response_status_space,
+
+      expect_response_reason_start,
+      expect_response_reason,
+      expect_response_reason_lf,
+
+      // Headers.
+      //
+      expect_header_start = 100,
+      expect_header_field,
+      expect_header_value_start,
+      expect_header_value,
+      expect_header_terminating_lf,
+
+      expect_terminating_lf,
+
+      done = 9999
+
+    };
+
+    /// Construct a new parser.
+    ///
+    explicit
+    basic_parser_t(expectation_t expect)
+      : expect_{expect}
+    {}
+
+    /// Copy-construct a new parser.
+    ///
+    basic_parser_t(basic_parser_t const&) = default;
+
+    /// Move-construct a new parser.
+    ///
+    basic_parser_t(basic_parser_t&&) = default;
+
+    /// Copy-assign this parser.
+    ///
+    basic_parser_t&
+    operator=(basic_parser_t const&) = default;
+
+    /// Move-assign this parser.
+    ///
+    basic_parser_t&
+    operator=(basic_parser_t&&) = default;
+
+    expectation_t expect_;
+
+    iterator_pair_t method_;
+    iterator_pair_t target_;
+    iterator_pair_t version_;
+
+    iterator_pair_t status_;
+    iterator_pair_t reason_;
+
+    std::vector<header_t> headers_;
+
+  private:
+    expectation_t
+    parse_char(Iterator it, std::error_code&);
+
+  };
+
+  /// Implements a basic request parser.
+  ///
+  template<typename Iterator>
+  class basic_request_parser_t
+    : public basic_parser_t<Iterator>
+  {
+  public:
+    basic_request_parser_t()
+      : basic_parser_t<Iterator>{basic_parser_t<Iterator>::expect_method_start}
+    {}
+
+    typename basic_parser_t<Iterator>::iterator_pair_t const&
+    method() const
+    {
+      return basic_parser_t<Iterator>::method_;
+    }
+
+    typename basic_parser_t<Iterator>::iterator_pair_t const&
+    target() const
+    {
+      return basic_parser_t<Iterator>::target_;
+    }
+  };
+
+  /// Implements a basic request parser.
+  ///
+  template<typename Iterator>
+  class basic_response_parser_t
+      : public basic_parser_t<Iterator>
+  {
+  public:
+    basic_response_parser_t()
+      : basic_parser_t<Iterator>{basic_parser_t<Iterator>::expect_response_version_h}
+    {}
+
+    typename basic_parser_t<Iterator>::iterator_pair_t const&
+    status() const
+    {
+      return basic_parser_t<Iterator>::status_;
+    }
+
+    typename basic_parser_t<Iterator>::iterator_pair_t const&
+    reason() const
+    {
+      return basic_parser_t<Iterator>::reason_;
+    }
+  };
+
+  template<typename Iterator>
+  void
+  extract_version(basic_parser_t<Iterator> const&, message_t&);
+
+  template<typename Iterator>
+  void
+  extract_headers(basic_parser_t<Iterator> const&, message_t&);
+
+  template<typename Iterator>
+  void
+  extract_method(basic_request_parser_t<Iterator> const&, request_t&);
+
+  template<typename Iterator>
+  void
+  extract_target(basic_request_parser_t<Iterator> const&, request_t&);
+
+  template<typename Iterator>
+  void
+  extract_status(basic_response_parser_t<Iterator> const&, response_t&);
+
+  template<typename Iterator>
+  void
+  extract_reason(basic_response_parser_t<Iterator> const&, response_t&);
+
+  template<typename Iterator>
+  void
+  extract_message(basic_parser_t<Iterator> const&, message_t&);
+
+  template<typename Iterator>
+  void
+  extract_message(basic_request_parser_t<Iterator> const&, request_t&);
+
+  template<typename Iterator>
+  void
+  extract_message(basic_response_parser_t<Iterator> const&, response_t&);
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t&, InputIterator, InputIterator);
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t&,
+                InputIterator,
+                InputIterator,
+                std::error_code&);
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t&,
+                basic_request_parser_t<InputIterator>&,
+                InputIterator,
+                InputIterator);
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t&,
+                basic_request_parser_t<InputIterator>&,
+                InputIterator,
+                InputIterator,
+                std::error_code&);
+
+  template<typename InputIterator>
+  InputIterator
+  parse_response(response_t&,
+                 InputIterator,
+                 InputIterator,
+                 std::error_code&);
+
+  template<typename InputIterator>
+  InputIterator
+  parse_response(response_t&,
+                 basic_response_parser_t<InputIterator>&,
+                 InputIterator,
+                 InputIterator);
+
+  template<typename InputIterator>
+  InputIterator
+  parse_response(response_t&,
+                 basic_response_parser_t<InputIterator>&,
+                 InputIterator,
+                 InputIterator,
+                 std::error_code&);
+
+  class parser_not_ready
+    : public std::logic_error
+  {
+  public:
+    parser_not_ready()
+      : std::logic_error{"parser not ready"}
+    {}
+
+  };
+
+} // namespace code::seafire::protocol
+
+#include <code/seafire/protocol/basic-parser.txx>
+
+#endif

code/seafire/protocol/basic-parser.txx

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+namespace code::seafire::protocol
+{
+
+  template<typename Iterator>
+  Iterator
+  basic_parser_t<Iterator>::
+  parse(Iterator first,
+        Iterator last,
+        std::error_code& ec)
+  {
+    while (first != last) {
+      expect_ = parse_char(first++, ec);
+
+      if (expect_ == done || ec) {
+        return first;
+      }
+    }
+
+    if (first == last) {
+      ec = parse_error_t::incomplete_message;
+    }
+
+    return first;
+  }
+
+  template<typename Iterator>
+  typename basic_parser_t<Iterator>::expectation_t
+  basic_parser_t<Iterator>::
+  parse_char(Iterator it, std::error_code& ec)
+  {
+    char const c{*it};
+
+    switch (expect_) {
+      case expect_method_start:
+        if (grammar::is_cr_or_lf(c)) { // ignore before request
+          return expect_method_start;
+        }
+        if (!grammar::is_tchar(c)) {
+          ec = parse_error_t::bad_method;
+          return done;
+        }
+        method_.first = it;
+        return expect_method;
+
+      case expect_method:
+        if (grammar::is_space(c)) {
+          method_.last = it;
+          return expect_target_start;
+        }
+        if (!grammar::is_tchar(c)) {
+          ec = parse_error_t::bad_method;
+          return done;
+        }
+        return expect_method;
+
+      case expect_target_start:
+        if (!grammar::is_target_char(c)) {
+          ec = parse_error_t::bad_target;
+          return done;
+        }
+
+        target_.first = it;
+        return expect_target;
+
+      case expect_target:
+        if (grammar::is_space(c)) {
+          target_.last = it;
+          return expect_version_h;
+        }
+
+        if (!grammar::is_target_char(c)) {
+          ec = parse_error_t::bad_target;
+          return done;
+        }
+
+        return expect_target;
+
+      case expect_version_h:
+        if ('H' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_version_ht;
+
+      case expect_version_ht:
+        if ('T' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_version_htt;
+
+      case expect_version_htt:
+        if ('T' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_version_http;
+
+      case expect_version_http:
+        if ('P' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_version_slash;
+
+      case expect_version_slash:
+        if ('/' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_version_major;
+
+      case expect_version_major:
+        if (!grammar::is_digit(c)) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        version_.first = it;
+        return expect_version_period;
+
+      case expect_version_period:
+        if ('.' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_version_minor;
+
+      case expect_version_minor:
+        if (!grammar::is_digit(c)) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        version_.last = it;
+        return expect_version_cr;
+
+      case expect_version_cr:
+        if (!grammar::is_cr(c)) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_version_lf;
+
+      case expect_version_lf:
+        if (!grammar::is_lf(c)) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_header_start;
+
+      case expect_response_version_h:
+        if ('H' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_response_version_ht;
+
+      case expect_response_version_ht:
+        if ('T' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_response_version_htt;
+
+      case expect_response_version_htt:
+        if ('T' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_response_version_http;
+
+      case expect_response_version_http:
+        if ('P' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_response_version_slash;
+
+      case expect_response_version_slash:
+        if ('/' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_response_version_major;
+
+      case expect_response_version_major:
+        if (!grammar::is_digit(c)) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        version_.first = it;
+        return expect_response_version_period;
+
+      case expect_response_version_period:
+        if ('.' != c) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_response_version_minor;
+
+      case expect_response_version_minor:
+        if (!grammar::is_digit(c)) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        version_.last = it;
+        return expect_response_version_space;
+
+      case expect_response_version_space:
+        if (!grammar::is_space(c)) {
+          ec = parse_error_t::bad_version;
+          return done;
+        }
+        return expect_response_status_1;
+
+      case expect_response_status_1:
+        if (!grammar::is_digit(c)) {
+          ec = parse_error_t::bad_status;
+          return done;
+        }
+        status_.first = status_.last = it;
+        return expect_response_status_2;
+
+      case expect_response_status_2:
+        if (!grammar::is_digit(c)) {
+          ec = parse_error_t::bad_status;
+          return done;
+        }
+        return expect_response_status_3;
+
+      case expect_response_status_3:
+        if (!grammar::is_digit(c)) {
+          ec = parse_error_t::bad_status;
+          return done;
+        }
+        return expect_response_status_space;
+
+      case expect_response_status_space:
+        if (' ' != c) {
+          ec = parse_error_t::bad_status;
+          return done;
+        }
+        status_.last = it;
+        return expect_response_reason_start;
+
+      case expect_response_reason_start:
+        if (c != '\t' && c != ' ' && !grammar::is_vchar(c) &&
+            grammar::is_obs_text(c)) {
+          ec = parse_error_t::bad_reason;
+          return done;
+        }
+        reason_.first = it;
+        return expect_response_reason;
+
+      case expect_response_reason:
+        if ('\r' == c) {
+          reason_.last = it;
+          return expect_response_reason_lf;
+        }
+        if (c != '\t' && c != ' ' && !grammar::is_vchar(c) &&
+            grammar::is_obs_text(c)) {
+          ec = parse_error_t::bad_reason;
+          return done;
+        }
+        return expect_response_reason;
+
+      case expect_response_reason_lf:
+        if (c != '\t' && c != ' ' && !grammar::is_vchar(c) &&
+            grammar::is_obs_text(c)) {
+          ec = parse_error_t::bad_reason;
+          return done;
+        }
+        return expect_header_start;
+
+      case expect_header_start:
+        if (grammar::is_cr(c)) {
+          return expect_terminating_lf;
+        }
+        if (!grammar::is_tchar(c)) {
+          ec = parse_error_t::bad_header_field;
+          return done;
+        }
+        headers_.emplace_back();
+        headers_.back().field.first = it;
+        return expect_header_field;
+
+      case expect_header_field:
+        if (':' == c) {
+          headers_.back().field.last = it;
+          return expect_header_value_start;
+        }
+        if (!grammar::is_tchar(c)) {
+          ec = parse_error_t::bad_header_field;
+          return done;
+        }
+        return expect_header_field;
+
+      case expect_header_value_start:
+        // TODO check through grammar
+        if (*it == ' ' || *it == '\t') {
+          return expect_header_value_start;
+        }
+
+        headers_.back().value.first = it;
+        if (grammar::is_cr(c)) {
+          headers_.back().value.last = it;
+          return expect_header_terminating_lf;
+        }
+        if (!grammar::is_space(c) && grammar::is_control_char(c)) {
+          throw __LINE__;
+          ec = parse_error_t::bad_header_value;
+          return done;
+        }
+        return expect_header_value;
+
+      case expect_header_value:
+        if (grammar::is_cr(c)) {
+          headers_.back().value.last = it;
+          return expect_header_terminating_lf;
+        }
+        if (!grammar::is_space(c) && grammar::is_control_char(c)) {
+          ec = parse_error_t::bad_header_value;
+          return done;
+        }
+        return expect_header_value;
+
+      case expect_header_terminating_lf:
+        if (!grammar::is_lf(c)) {
+          ec = parse_error_t::bad_header_value;
+          return done;
+        }
+        return expect_header_start;
+
+      case expect_terminating_lf:
+        if (!grammar::is_lf(c)) {
+          ec = parse_error_t::bad_terminator;
+        }
+        return done;
+
+      case done: throw parser_not_ready{};
+    }
+
+    throw std::logic_error{"parser in invalid state"};
+  }
+
+  template<typename Iterator>
+  void
+  extract_version(basic_parser_t<Iterator> const& parser, message_t& m)
+  {
+    version_t v{static_cast<unsigned short>(*parser.version().first - '0'),
+                static_cast<unsigned short>(*parser.version().last - '0')};
+
+    m.set_version(std::move(v));
+  }
+
+  template<typename Iterator>
+  void
+  extract_headers(basic_parser_t<Iterator> const& parser, message_t& m)
+  {
+    header_collection_t headers;
+
+    for (auto const& j : parser.headers()) {
+      std::string key{j.field.first, j.field.last};
+      std::string value{j.value.first, j.value.last};
+
+      // Calling header.set() would replace any earlier set
+      // header with the same key.
+      //
+      headers.append(std::move(key), std::move(value));
+    }
+
+    m.set_headers(std::move(headers));
+  }
+
+  template<typename Iterator>
+  void
+  extract_method(basic_request_parser_t<Iterator> const& parser, request_t& r)
+  {
+    std::string method{parser.method().first, parser.method().last};
+    r.set_method(std::move(method));
+  }
+
+  template<typename Iterator>
+  void
+  extract_target(basic_request_parser_t<Iterator> const& parser, request_t& r)
+  {
+    std::string target{parser.target().first, parser.target().last};
+
+    r.set_target(std::move(target));
+
+    auto target_uri = uri::try_parse(parser.target().first, parser.target().last);
+
+    if (target_uri) {
+      r.set_target_uri(std::move(*target_uri));
+    }
+  }
+
+  template<typename Iterator>
+  void
+  extract_status(basic_response_parser_t<Iterator> const& parser, response_t& r)
+  {
+    auto digit1 = parser.status().first;
+    auto digit2 = digit1 + 1;
+    auto digit3 = digit1 + 2;
+
+    unsigned long long cdig1 = (*digit1 - '0');
+    unsigned long long cdig2 = (*digit2 - '0');
+    unsigned long long cdig3 = (*digit3 - '0');
+
+    r.set_status((cdig1 * 100) + (cdig2 * 10) + cdig3);
+  }
+
+  template<typename Iterator>
+  void
+  extract_reason(basic_response_parser_t<Iterator> const& parser, response_t& r)
+  {
+    std::string reason{parser.reason().first, parser.reason().last};
+
+    r.set_status({r.status().code(), std::move(reason)});
+  }
+
+  template<typename Iterator>
+  void
+  extract_message(basic_parser_t<Iterator> const& parser, message_t& m)
+  {
+    extract_version(parser, m);
+    extract_headers(parser, m);
+  }
+
+  template<typename Iterator>
+  void
+  extract_message(basic_request_parser_t<Iterator> const& parser, request_t& r)
+  {
+    extract_message(parser, static_cast<message_t&>(r));
+    extract_method(parser, r);
+    extract_target(parser, r);
+  }
+
+  template<typename Iterator>
+  void
+  extract_message(basic_response_parser_t<Iterator> const& parser, response_t& r)
+  {
+    extract_message(parser, static_cast<message_t&>(r));
+    extract_status(parser, r);
+    extract_reason(parser, r);
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t& r, InputIterator first, InputIterator last)
+  {
+    basic_request_parser_t<InputIterator> parser;
+    return parse_request(r, parser, first, last);
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t& r,
+                InputIterator first,
+                InputIterator last,
+                std::error_code& ec)
+  {
+    basic_request_parser_t<InputIterator> parser;
+    return parse_request(r, parser, first, last, ec);
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t& r,
+                basic_request_parser_t<InputIterator>& parser,
+                InputIterator first,
+                InputIterator last)
+  {
+    first = parser.parse(first, last);
+    extract_message(parser, r);
+    return first;
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_request(request_t& r,
+                basic_request_parser_t<InputIterator>& parser,
+                InputIterator first,
+                InputIterator last,
+                std::error_code& ec)
+  {
+    first = parser.parse(first, last, ec);
+
+    if (ec)
+      return first;
+
+    extract_message(parser, r);
+
+    return first;
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_response(response_t& r, InputIterator first, InputIterator last)
+  {
+    basic_response_parser_t<InputIterator> parser;
+    return parse_response(r, parser, first, last);
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_response(response_t& r,
+                 InputIterator first,
+                 InputIterator last,
+                 std::error_code& ec)
+  {
+    basic_response_parser_t<InputIterator> parser;
+    return parse_response(r, parser, first, last, ec);
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_response(response_t& r,
+                 basic_response_parser_t<InputIterator>& parser,
+                 InputIterator first,
+                 InputIterator last)
+  {
+    first = parser.parse(first, last);
+    extract_message(parser, r);
+    return first;
+  }
+
+  template<typename InputIterator>
+  InputIterator
+  parse_response(response_t& r,
+                 basic_response_parser_t<InputIterator>& parser,
+                 InputIterator first,
+                 InputIterator last,
+                 std::error_code& ec)
+  {
+    first = parser.parse(first, last, ec);
+
+    if (ec) {
+      return first;
+    }
+
+    extract_message(parser, r);
+
+    return first;
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/buildfile

@@ -0,0 +1,66 @@
+intf_libs = # Interface dependencies.
+impl_libs = # Implementation dependencies.
+
+import intf_libs =+ libasio%lib{asio}
+import intf_libs =+ libcode-uri%lib{code-uri}
+import intf_libs =+ libcode-seafire-common%lib{code-seafire-common}
+
+./: lib{code-seafire-protocol}: libul{code-seafire-protocol}
+
+libul{code-seafire-protocol}: {hxx ixx txx cxx}{** -**.test... -version} \
+                              {hxx            }{                version}
+
+libul{code-seafire-protocol}: $impl_libs $intf_libs
+
+# Unit tests.
+#
+exe{*.test}:
+{
+  test = true
+  install = false
+}
+
+for t: cxx{**.test...}
+{
+  d = $directory($t)
+  n = $name($t)...
+
+  ./: $d/exe{$n}: $t $d/{hxx ixx txx}{+$n} $d/testscript{+$n}
+  $d/exe{$n}: libul{code-seafire-protocol}: bin.whole = false
+}
+
+hxx{version}: in{version} $src_root/manifest
+{
+  dist  = true
+  clean = ($src_root != $out_root)
+}
+
+# Build options.
+#
+cxx.poptions =+ "-I$out_root" "-I$src_root"
+
+# Export options.
+#
+lib{code-seafire-protocol}:
+{
+  cxx.export.poptions = "-I$out_root" "-I$src_root"
+  cxx.export.libs = $intf_libs
+}
+
+# For pre-releases use the complete version to make sure they cannot
+# be used in place of another pre-release or the final version. See
+# the version module for details on the version.* variable values.
+#
+if $version.pre_release
+  lib{code-seafire-protocol}: bin.lib.version = "-$version.project_id"
+else
+  lib{code-seafire-protocol}: bin.lib.version = "-$version.major.$version.minor"
+
+# Install into the code/seafire/protocol/ subdirectory of, say, /usr/include/
+# recreating subdirectories.
+#
+{hxx ixx txx}{*}:
+{
+  install         = include/code/seafire/protocol/
+  install.subdirs = true
+}

code/seafire/protocol/connection.cxx

@@ -0,0 +1,217 @@
+#include <code/seafire/protocol/connection.hxx>
+
+#include <code/seafire/protocol/read.hxx>
+#include <code/seafire/protocol/read-content.hxx>
+#include <code/seafire/protocol/write.hxx>
+
+#include <code/seafire/protocol/rfc7230/content-length.hxx>
+
+namespace code::seafire::protocol
+{
+
+  /// Construct a new HTTP connection.
+  ///
+  /// \param s The I/O stream.
+  /// \param max The maximum size of the connection buffer.
+  ///
+  connection_t::
+  connection_t(common::io::stream_t& s, std::size_t max)
+    : stream_{s},
+      buffer_{max}
+  {}
+
+  /// Destroy this connection.
+  ///
+  connection_t::
+  ~connection_t() noexcept = default;
+
+  /// Access the underlying I/O stream.
+  ///
+  common::io::stream_t&
+  connection_t::
+  get_stream()
+  {
+    return stream_;
+  }
+
+  asio::any_io_executor const&
+  connection_t::
+  get_executor()
+  {
+    return get_stream().get_executor();
+  }
+
+  void
+  connection_t::
+  cancel()
+  {
+    get_stream().cancel();
+  }
+
+  /// Perform a blocking read of a request.
+  ///
+  /// \param r       The target request object.
+  /// \param content The target request content buffer.
+  /// \throws std::system_error Thrown on error.
+  ///
+  void
+  connection_t::
+  read(request_t& r, asio::streambuf& content)
+  {
+    protocol::read(get_stream(), buffer_, r);
+    read_content(get_stream(), buffer_, content, r);
+  }
+
+  /// Perform a blocking read of a request.
+  ///
+  /// \param r       The target request object.
+  /// \param content The target request content buffer.
+  ///
+  void
+  connection_t::
+  read(request_t& r,
+       asio::streambuf& content,
+       std::error_code& ec)
+  {
+    protocol::read(get_stream(), buffer_, r, ec);
+
+    if (ec) {
+      return;
+    }
+
+    read_content(get_stream(), buffer_, content, r, ec);
+  }
+
+  /// Initiate an non-blocking read of a request.
+  ///
+  /// \param r       The target request object.
+  /// \param content The target request content buffer.
+  /// \param handler The handler to invoke on completion.
+  ///
+  void
+  connection_t::
+  async_read(request_t& r,
+             asio::streambuf& content,
+             read_handler_t handler)
+  {
+    auto bound = [this, &r, &content, handler](std::error_code const& ec)
+    {
+      if (ec) {
+        handler(ec);
+        return;
+      }
+
+      async_read_content(get_stream(), buffer_, content, r, handler);
+    };
+
+    protocol::async_read(get_stream(), buffer_, r, bound);
+  }
+
+  /// Perform a blocking read of a response.
+  ///
+  /// \param r       The target response object.
+  /// \param content The target response content buffer.
+  /// \throws std::system_error Thrown on error.
+  ///
+  void
+  connection_t::
+  read(response_t& r, asio::streambuf& content)
+  {
+    protocol::read(get_stream(), buffer_, r);
+    read_content(get_stream(), buffer_, content, r);
+  }
+
+  /// Perform a blocking read of a response.
+  ///
+  /// \param r       The target response object.
+  /// \param content The target response content buffer.
+  ///
+  void
+  connection_t::
+  read(response_t& r,
+       asio::streambuf& content,
+       std::error_code& ec)
+  {
+    protocol::read(get_stream(), buffer_, r, ec);
+
+    if (ec) {
+      return;
+    }
+
+    read_content(get_stream(), buffer_, content, r, ec);
+  }
+
+  /// Initiate an non-blocking read of a response.
+  ///
+  /// \param r       The target response object.
+  /// \param content The target response content buffer.
+  /// \param handler The handler to invoke on completion.
+  ///
+  void
+  connection_t::
+  async_read(response_t& r,
+             asio::streambuf& content,
+             read_handler_t handler)
+  {
+    auto bound = [this, &r, &content, handler](std::error_code const& ec)
+    {
+      if (ec) {
+        handler(ec);
+        return;
+      }
+
+      async_read_content(get_stream(), buffer_, content, r, handler);
+    };
+
+    protocol::async_read(get_stream(), buffer_, r, bound);
+  }
+
+  /// Initiate a blocking write of a request message.
+  ///
+  void
+  connection_t::
+  write(request_t const& r, common::io::const_buffers_t const& content)
+  {
+    protocol::write(get_stream(), r, content);
+  }
+
+  /// Initiate a blocking write of a request message.
+  ///
+  void
+  connection_t::
+  write(request_t const& r, common::io::const_buffers_t const& content, std::error_code& ec)
+  {
+    protocol::write(get_stream(), r, content, ec);
+  }
+
+  /// Initiate a non-blocking write of a request message.
+  ///
+  void
+  connection_t::
+  async_write(request_t const& r, common::io::const_buffers_t const& content, write_handler_t handler)
+  {
+    protocol::async_write(get_stream(), r, content, handler);
+  }
+
+  void
+  connection_t::
+  write(response_t const& r, common::io::const_buffers_t const& content)
+  {
+    protocol::write(get_stream(), r, content);
+  }
+
+  void
+  connection_t::
+  write(response_t const& r, common::io::const_buffers_t const& content, std::error_code& ec)
+  {
+    protocol::write(get_stream(), r, content, ec);
+  }
+
+  void
+  connection_t::
+  async_write(response_t const& r, common::io::const_buffers_t const& content, write_handler_t handler)
+  {
+    protocol::async_write(get_stream(), r, content, handler);
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/connection.hxx

@@ -0,0 +1,93 @@
+#ifndef code__seafire__protocol__connection_hxx_
+#define code__seafire__protocol__connection_hxx_
+
+#include <code/seafire/protocol/request.hxx>
+#include <code/seafire/protocol/response.hxx>
+
+#include <code/seafire/common/io/stream.hxx>
+
+#include <asio.hpp>
+
+#include <functional>
+#include <system_error>
+
+namespace code::seafire::protocol
+{
+
+  /// Implements an HTTP/1.0/1.1 connection.
+  ///
+  class connection_t
+  {
+  public:
+    /// Asynchronous read handler type.
+    ///
+    using read_handler_t = std::function<void(std::error_code)>;
+
+    /// Asynchronous write handler type.
+    ///
+    using write_handler_t = std::function<void(std::error_code)>;
+
+    connection_t(common::io::stream_t&, std::size_t);
+
+    connection_t(connection_t const&) = delete;
+    connection_t(connection_t&&) = delete;
+
+    ~connection_t() noexcept;
+
+    common::io::stream_t&
+    get_stream();
+
+    asio::any_io_executor const&
+    get_executor();
+
+    void
+    cancel();
+
+    void
+    read(request_t&, asio::streambuf&);
+
+    void
+    read(request_t&, asio::streambuf&, std::error_code&);
+
+    void
+    async_read(request_t&, asio::streambuf&, read_handler_t);
+
+    void
+    read(response_t&, asio::streambuf&);
+
+    void
+    read(response_t&, asio::streambuf&, std::error_code&);
+
+    void
+    async_read(response_t&, asio::streambuf&, read_handler_t);
+
+    void
+    write(request_t const&, common::io::const_buffers_t const&);
+
+    void
+    write(request_t const&, common::io::const_buffers_t const&, std::error_code&);
+
+    void
+    async_write(request_t const&, common::io::const_buffers_t const&, write_handler_t);
+
+    void
+    write(response_t const&, common::io::const_buffers_t const&);
+
+    void
+    write(response_t const&, common::io::const_buffers_t const&, std::error_code&);
+
+    void
+    async_write(response_t const&, common::io::const_buffers_t const&, write_handler_t);
+
+    connection_t& operator=(connection_t const&) = delete;
+    connection_t& operator=(connection_t&&) = delete;
+
+  private:
+    common::io::stream_t& stream_;
+    asio::streambuf buffer_;
+
+  };
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/date-time.cxx

@@ -0,0 +1,42 @@
+#include <code/seafire/protocol/date-time.hxx>
+
+#include <iomanip>
+#include <locale>
+
+namespace code::seafire::protocol
+{
+
+  std::string
+  format_http_date(std::chrono::system_clock::time_point const& time_point)
+  {
+    static constexpr const char time_format[] = "%a, %d %b %Y %H:%M:%S GMT";
+
+    std::time_t now_c = std::chrono::system_clock::to_time_t(time_point);
+
+    std::stringstream str;
+    str.imbue(std::locale{});
+    str << std::put_time(std::gmtime(&now_c), time_format);
+
+    return str.str();
+  }
+
+  std::optional<std::chrono::system_clock::time_point>
+  try_parse_http_date(std::string const& text)
+  {
+    static constexpr const char time_format[] = "%a, %d %b %Y %H:%M:%S GMT";
+
+    std::tm tm{};
+
+    std::istringstream str{text};
+    str.imbue(std::locale{});
+    str >> std::get_time(&tm, time_format);
+
+    if (str.fail())
+      return {};
+
+    std::time_t time = std::mktime(&tm);
+
+    return std::chrono::system_clock::from_time_t(time);
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/date-time.hxx

@@ -0,0 +1,19 @@
+#ifndef code__seafire__protocol__date_time_hxx_
+#define code__seafire__protocol__date_time_hxx_
+
+#include <chrono>
+#include <optional>
+#include <string>
+
+namespace code::seafire::protocol
+{
+
+  std::string
+  format_http_date(std::chrono::system_clock::time_point const&);
+
+  std::optional<std::chrono::system_clock::time_point>
+  try_parse_http_date(std::string const&);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/error.cxx

@@ -0,0 +1,88 @@
+#include <code/seafire/protocol/error.hxx>
+
+namespace code::seafire::protocol
+{
+
+  std::error_category const&
+  get_parse_error_category()
+  {
+    class category_t
+      : public std::error_category
+    {
+    public:
+      char const*
+      name() const noexcept override
+      {
+        return "code.seafire.parser";
+      }
+
+      std::string
+      message(int ec) const override
+      {
+        switch (static_cast<parse_error_t>(ec)) {
+          case parse_error_t::incomplete_message: return "incomplete message";
+          case parse_error_t::bad_version: return "bad version";
+          case parse_error_t::bad_header_field: return "bad header field";
+          case parse_error_t::bad_header_value: return "bad header value";
+          case parse_error_t::bad_terminator: return "bad terminator";
+          case parse_error_t::bad_method: return "bad method";
+          case parse_error_t::bad_target: return "bad target";
+          case parse_error_t::bad_status: return "bad status";
+          case parse_error_t::bad_reason: return "bad reason";
+        }
+
+        return "code.seafire.parser error";
+      }
+    };
+
+    static category_t const category;
+
+    return category;
+  }
+
+  std::error_code
+  make_error_code(parse_error_t error)
+  {
+    return {static_cast<int>(error), get_parse_error_category()};
+  }
+
+  std::error_category const&
+  get_protocol_error_category()
+  {
+    class category_t
+      : public std::error_category
+    {
+    public:
+      char const*
+      name() const noexcept override
+      {
+        return "code.seafire.protocol";
+      }
+
+      std::string
+      message(int ec) const override
+      {
+        switch (static_cast<protocol_error_t>(ec)) {
+          case protocol_error_t::invalid_content_length: return "invalid content length";
+          case protocol_error_t::request_too_large: return "request too large";
+          case protocol_error_t::length_required: return "length required";
+          case protocol_error_t::invalid_header_value: return "invalid header value";
+        }
+
+        return "code.seafire.protocol error";
+      }
+
+    };
+
+    static category_t const category;
+
+    return category;
+  }
+
+  std::error_code
+  make_error_code(protocol_error_t error)
+  {
+    return {static_cast<int>(error), get_protocol_error_category()};
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/error.hxx

@@ -0,0 +1,79 @@
+#ifndef code__seafire__protocol__error_hxx_
+#define code__seafire__protocol__error_hxx_
+
+#include <string>
+#include <system_error>
+
+namespace code::seafire::protocol
+{
+
+  enum class parse_error_t
+  {
+    incomplete_message = 1,
+
+    // Common.
+    bad_version,
+    bad_header_field,
+    bad_header_value,
+    bad_terminator,
+
+    // Request-specific.
+    bad_method,
+    bad_target,
+
+    // Response-specific.
+    bad_status,
+    bad_reason
+
+  };
+
+  std::error_category const&
+  get_parse_error_category();
+
+  std::error_code
+  make_error_code(parse_error_t);
+
+  enum class protocol_error_t
+  {
+    // indicates an invalid content-length.
+    //
+    invalid_content_length = 1,
+
+    // indicates a too big request body.
+    //
+    request_too_large,
+
+    // content-length missing.
+    //
+    length_required,
+
+    // For now.
+    //
+    invalid_header_value
+
+  };
+
+  std::error_category const&
+  get_protocol_error_category();
+
+  std::error_code
+  make_error_code(protocol_error_t);
+
+} // namespace code::seafire::protocol
+
+namespace std
+{
+
+  template<>
+  struct is_error_code_enum<code::seafire::protocol::parse_error_t>
+    : true_type
+  {};
+
+  template<>
+  struct is_error_code_enum<code::seafire::protocol::protocol_error_t>
+    : true_type
+  {};
+
+} // namespace std
+
+#endif

code/seafire/protocol/grammar.hxx

@@ -0,0 +1,49 @@
+#ifndef code__seafire__protocol__grammar_hxx_
+#define code__seafire__protocol__grammar_hxx_
+
+namespace code::seafire::protocol::grammar
+{
+
+  bool
+  is_cr(char c);
+
+  bool
+  is_lf(char c);
+
+  bool
+  is_cr_or_lf(char c);
+
+  bool
+  is_space(char c);
+
+  bool
+  is_digit(char c);
+
+  bool
+  is_vchar(char c);
+
+  bool
+  is_tchar(char c);
+
+  bool
+  is_control_char(char c);
+
+  bool
+  is_obs_text(char c);
+
+  bool
+  is_hex(char c);
+
+  bool
+  is_target_char(char c);
+
+  template<typename InputIterator>
+  void
+  skip_space(InputIterator& it, InputIterator const& end);
+
+} // namespace code::seafire::protocol::grammar
+
+#include <code/seafire/protocol/grammar.ixx>
+#include <code/seafire/protocol/grammar.txx>
+
+#endif

code/seafire/protocol/grammar.ixx

@@ -0,0 +1,183 @@
+namespace code::seafire::protocol::grammar
+{
+
+  /// Check if \a c is carriage-return.
+  ///
+  inline
+  bool
+  is_cr(char c)
+  {
+    return c == '\r';
+  }
+
+  /// Check if \a c is line-feed.
+  ///
+  inline
+  bool
+  is_lf(char c)
+  {
+    return c == '\n';
+  }
+
+  /// Check if \a c is carriage-return or line-feed.
+  ///
+  inline
+  bool
+  is_cr_or_lf(char c)
+  {
+    return c == '\r' || c == '\n';
+  }
+
+  /// Check if \a c is spage or tab.
+  ///
+  inline
+  bool
+  is_space(char c)
+  {
+    return c == ' ' || c == '\t';
+  }
+
+  /// Check if \a c is a decimal digit.
+  ///
+  inline
+  bool
+  is_digit(char c)
+  {
+    return 0 <= 'c' && c <= '9';
+  }
+
+  /// Check if \a c is a vchar.
+  ///
+  inline
+  bool
+  is_vchar(char c)
+  {
+    auto u = static_cast< unsigned char >(c);
+
+    if (u == 0x7f || u >= 0x80) {
+      return false;
+    }
+
+    return true;
+  }
+
+  /// Check if \a c is a tchar.
+  ///
+  inline
+  bool
+  is_tchar(char c)
+  {
+    if ('a' <= c && c <= 'z') {
+      return true;
+    }
+
+    if ('A' <= c && c <= 'Z') {
+      return true;
+    }
+
+    if ('0' <= c && c <= '9') {
+      return true;
+    }
+
+    switch (c) {
+      case '!':
+      case '#':
+      case '$':
+      case '%':
+      case '&':
+      case '\'':
+      case '*':
+      case '+':
+      case '-':
+      case '.':
+      case '^':
+      case '_':
+      case '`':
+      case '|':
+      case '~':
+        return true;
+    }
+
+    return false;
+  }
+
+  /// Check if \a c is a control char.
+  ///
+  inline
+  bool
+  is_control_char(char c)
+  {
+    return c <= 31 || c == 127;
+  }
+
+  /// Check if \a c is obs-text.
+  ///
+  inline
+  bool
+  is_obs_text(char c)
+  {
+    auto u = static_cast< unsigned char >(c);
+    return u >= 0x80 && u <= 0xFF;
+  }
+
+  /// Check if \a c is a hexadecimal digit.
+  ///
+  inline
+  bool
+  is_hex(char c)
+  {
+    if ('0' <= c && c <= '9') {
+      return true;
+    }
+
+    if ('a' <= c && c <= 'f') {
+      return true;
+    }
+
+    if ('A' <= c && c <= 'F') {
+      return true;
+    }
+
+    return false;
+  }
+
+  /// Check if \a c is a target-char.
+  ///
+  inline
+  bool
+  is_target_char(char c)
+  {
+    switch (c) {
+      case '!':
+      case '$':
+      case '%':
+      case '&':
+      case '(':
+      case ')':
+      case '*':
+      case '+':
+      case ',':
+      case '-':
+      case '.':
+      case '/':
+      case ':':
+      case ';':
+      case '=':
+      case '?':
+      case '@':
+      case '\'':
+      case '_':
+      case '~':
+        return true;
+    }
+
+    if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z'))
+      return true;
+
+    if ('0' <= c && c <= '9')
+      return true;
+
+    return false;
+  }
+
+} // namespace code::seafire::protocol::grammar

code/seafire/protocol/grammar.txx

@@ -0,0 +1,15 @@
+namespace code::seafire::protocol::grammar
+{
+
+  /// Skip space.
+  ///
+  template<typename InputIterator>
+  void
+  skip_space(InputIterator& it, InputIterator const& end)
+  {
+    while (it != end && is_space(*it)) {
+      ++it;
+    }
+  }
+
+} // namespace code::seafire::protocol::grammar

code/seafire/protocol/header-collection.cxx

@@ -0,0 +1,139 @@
+#include <code/seafire/protocol/header-collection.hxx>
+
+#include <locale>
+
+namespace code::seafire::protocol
+{
+
+  /// Set a header.
+  ///
+  /// Calling set
+  void
+  header_collection_t::
+  set(std::string key, std::string value)
+  {
+    normalize(key);
+    kv_store_.erase(key);
+    kv_store_.emplace(std::move(key), std::move(value));
+  }
+
+  /// Append a header value.
+  ///
+  void
+  header_collection_t::
+  append(std::string key, std::string value)
+  {
+    normalize(key);
+    kv_store_.emplace(std::move(key), std::move(value));
+  }
+
+  /// Erase a header.
+  ///
+  void
+  header_collection_t::
+  erase(std::string key)
+  {
+    normalize(key);
+    kv_store_.erase(key);
+  }
+
+  /// Check if this collection contains a header.
+  ///
+  bool
+  header_collection_t::
+  contains(std::string key) const
+  {
+    normalize(key);
+    return kv_store_.find(key) != kv_store_.end();
+  }
+
+  /// Get a header.
+  ///
+  std::vector<std::string>
+  header_collection_t::
+  get(std::string key) const
+  {
+    normalize(key);
+
+    std::vector<std::string> strings;
+
+    auto lower = kv_store_.lower_bound(key);
+    auto upper = kv_store_.upper_bound(key);
+
+    while (lower != upper) {
+      strings.push_back(lower->second);
+      ++lower;
+    }
+
+    return strings;
+  }
+
+  /// Get a header.
+  ///
+  std::optional<std::string>
+  header_collection_t::
+  get_one(std::string key) const
+  {
+    normalize(key);
+
+    auto lower = kv_store_.lower_bound(key);
+    auto upper = kv_store_.upper_bound(key);
+
+    if (lower != upper)
+      return lower->second;
+
+    return {};
+  }
+
+  header_collection_t::const_iterator
+  header_collection_t::
+  begin() const
+  {
+    return kv_store_.begin();
+  }
+
+  header_collection_t::const_iterator
+  header_collection_t::
+  cbegin() const
+  {
+    return kv_store_.cbegin();
+  }
+
+  header_collection_t::const_iterator
+  header_collection_t::
+  end() const
+  {
+    return kv_store_.end();
+  }
+
+  header_collection_t::const_iterator
+  header_collection_t::
+  cend() const
+  {
+    return kv_store_.cend();
+  }
+
+  /// Normalize header name.
+  ///
+  void
+  header_collection_t::
+  normalize(std::string& name)
+  {
+    std::locale loc{ "C" };
+
+    for (auto& c : name)
+      c = std::tolower(c, loc);
+  }
+
+  /// Write headers to an output stream.
+  ///
+  std::ostream&
+  operator<<(std::ostream& o, header_collection_t const& h)
+  {
+    for (auto const& j : h)
+      o << j.first << " = " << j.second << '\n';
+
+    return o;
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/header-collection.hxx

@@ -0,0 +1,65 @@
+#ifndef code__seafire__protocol__header_collection_hxx_
+#define code__seafire__protocol__header_collection_hxx_
+
+#include <map>
+#include <optional>
+#include <ostream>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol
+{
+
+  /// Represents a collection of HTTP headers.
+  ///
+  class header_collection_t
+  {
+  public:
+    /// Iterator type.
+    ///
+    using const_iterator = std::multimap<std::string, std::string>::const_iterator;
+
+    void
+    set(std::string, std::string);
+
+    void
+    append(std::string, std::string);
+
+    void
+    erase(std::string);
+
+    bool
+    contains(std::string) const;
+
+    std::vector<std::string>
+    get(std::string) const;
+
+    std::optional<std::string>
+    get_one(std::string) const;
+
+    const_iterator
+    begin() const;
+
+    const_iterator
+    cbegin() const;
+
+    const_iterator
+    end() const;
+
+    const_iterator
+    cend() const;
+
+    static
+    void
+    normalize(std::string&);
+
+  private:
+    std::multimap<std::string, std::string> kv_store_;
+  };
+
+  std::ostream&
+  operator<<(std::ostream&, header_collection_t const&);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/match.cxx

@@ -0,0 +1,66 @@
+#include <code/seafire/protocol/match.hxx>
+
+namespace code::seafire::protocol
+{
+
+  match_request_t::
+  match_request_t(request_t& m)
+    : message_{m}
+  {}
+
+  std::pair<char const*, bool>
+  match_request_t::
+  operator()(char const* begin, char const* end, std::error_code& ec)
+  {
+    if (begin == end)
+      return std::make_pair(begin, false);
+
+    parser_type p;
+
+    auto const last = p.parse(begin, end, ec);
+
+    if (ec == parse_error_t::incomplete_message) {
+      // reset ec, so that the match will be attempted again.
+      //
+      ec = std::error_code{};
+      return std::make_pair(begin, false);
+    }
+
+    if (ec)
+      return std::make_pair(begin, true);
+
+    extract_message(p, message_);
+    return std::make_pair(last, true);
+  }
+
+  match_response_t::
+  match_response_t(response_t& m)
+    : message_{m}
+  {}
+
+  std::pair<char const*, bool>
+  match_response_t::
+  operator()(char const* begin, char const* end, std::error_code& ec)
+  {
+    if (begin == end)
+      return std::make_pair(begin, false);
+
+    parser_type p;
+
+    auto const last = p.parse(begin, end, ec);
+
+    if (ec == parse_error_t::incomplete_message) {
+      // reset ec, so that the match will be attempted again.
+      //
+      ec = std::error_code{};
+      return std::make_pair(begin, false);
+    }
+
+    if (ec)
+      return std::make_pair(begin, true);
+
+    extract_message(p, message_);
+    return std::make_pair(last, true);
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/match.hxx

@@ -0,0 +1,53 @@
+#ifndef code__seafire__protocol__match_hxx_
+#define code__seafire__protocol__match_hxx_
+
+#include <code/seafire/protocol/basic-parser.hxx>
+#include <code/seafire/protocol/error.hxx>
+#include <code/seafire/protocol/request.hxx>
+#include <code/seafire/protocol/response.hxx>
+
+#include <system_error>
+#include <utility>
+
+namespace code::seafire::protocol
+{
+
+  /// Implements an input match condition for matching a request.
+  ///
+  class match_request_t
+  {
+  public:
+    using parser_type = basic_request_parser_t<char const*>;
+
+    explicit
+    match_request_t(request_t& m);
+
+    std::pair<char const*, bool>
+    operator()(char const*, char const*, std::error_code&);
+
+  private:
+    request_t& message_;
+
+  };
+
+  /// Implements an input match condition for matching a response.
+  ///
+  class match_response_t
+  {
+  public:
+    using parser_type = basic_response_parser_t<char const*>;
+
+    explicit
+    match_response_t(response_t& m);
+
+    std::pair<char const*, bool>
+    operator()(char const*, char const*, std::error_code&);
+
+  private:
+    response_t& message_;
+
+  };
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/media-type.cxx

@@ -0,0 +1,140 @@
+#include <code/seafire/protocol/media-type.hxx>
+
+#include <sstream>
+
+namespace code::seafire::protocol
+{
+
+  /// Construct a new empty media type.
+  ///
+  media_type_t::
+  media_type_t() = default;
+
+  /// Construct a new media type.
+  ///
+  media_type_t::
+  media_type_t(std::string type, std::string subtype)
+    : type_{std::move(type)}, subtype_{std::move(subtype)}
+  {}
+
+  /// Construct a new media type.
+  ///
+  media_type_t::
+  media_type_t(std::string type,
+               std::string subtype,
+               params_t params)
+    : type_{std::move(type) },
+      subtype_{std::move(subtype)},
+      params_{std::move(params)}
+  {}
+
+  /// Get the type of this media type.
+  ///
+  std::string const&
+  media_type_t::
+  type() const
+  {
+    return type_;
+  }
+
+  /// Get the subtype of this media type.
+  ///
+  std::string const&
+  media_type_t::
+  subtype() const
+  {
+    return subtype_;
+  }
+
+  /// Get the parameters of this media type.
+  ///
+  media_type_t::params_t const&
+  media_type_t::
+  params() const
+  {
+    return params_;
+  }
+
+  /// Attempt to parse a media type.
+  ///
+  std::optional< media_type_t>
+  media_type_t::
+  try_parse(std::string const& str, std::error_code& ec)
+  {
+    auto begin = str.begin();
+    return try_parse(begin, str.end(), ec);
+  }
+
+  /// Compare two media types for equality.
+  ///
+  /// Parameters are ignored.
+  ///
+  /// \relatesalso media_type_t
+  ///
+  bool
+  operator==(media_type_t const& lhs, media_type_t const& rhs)
+  {
+    if (lhs.type() != rhs.type()) {
+      if ("*" != lhs.type() && "*" != rhs.type()) {
+        return false;
+      }
+    }
+
+    if (lhs.subtype() != rhs.subtype()) {
+      if ("*" != lhs.subtype() && "*" != rhs.subtype()) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  /// Compare two media types for inequality.
+  ///
+  /// Parameters are ignored.
+  ///
+  /// \relatesalso media_type_t
+  ///
+  bool
+  operator!=(media_type_t const& lhs, media_type_t const& rhs)
+  {
+    return !(lhs == rhs);
+  }
+
+  /// Write media type to an output stream.
+  ///
+  /// \relatesalso media_type_t
+  ///
+  std::ostream&
+  to_stream(std::ostream& o, media_type_t const& m)
+  {
+    o << m.type() << '/' << m.subtype();
+    for (auto const& j : m.params()) {
+      o << "; " << j.first << '=' << j.second;
+    }
+    return o;
+  }
+
+  /// Convert a media type to a string.
+  ///
+  /// \relatesalso media_type_t
+  ///
+  std::string
+  to_string(media_type_t const& m)
+  {
+    std::stringstream str;
+    to_stream(str, m);
+    return str.str();
+  }
+
+  /// Write a media type to an output stream.
+  ///
+  /// \relatesalso media_type_t
+  ///
+  std::ostream&
+  operator<<(std::ostream& o, media_type_t const& m)
+  {
+    return to_stream(o, m);
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/media-type.hxx

@@ -0,0 +1,77 @@
+#ifndef code__seafire__protocol__media_type_hxx_
+#define code__seafire__protocol__media_type_hxx_
+
+#include <code/seafire/protocol/grammar.hxx>
+
+#include <map>
+#include <optional>
+#include <string>
+#include <system_error>
+
+namespace code::seafire::protocol
+{
+
+  /// Implements a media type according to RFC 2046.
+  ///
+  class media_type_t
+  {
+  public:
+    /// Media type parameters type.
+    ///
+    using params_t = std::map<std::string, std::string>;
+
+    media_type_t();
+
+    media_type_t(std::string, std::string);
+
+    media_type_t(std::string,
+                 std::string,
+                 params_t);
+
+    std::string const&
+    type() const;
+
+    std::string const&
+    subtype() const;
+
+    params_t const&
+    params() const;
+
+    template<typename InputIterator>
+    static
+    std::optional<media_type_t>
+    try_parse(InputIterator&,
+              InputIterator const&,
+              std::error_code&);
+
+    static
+    std::optional<media_type_t>
+    try_parse(std::string const&, std::error_code&);
+
+  private:
+    std::string type_;
+    std::string subtype_;
+    params_t params_;
+
+  };
+
+  bool
+  operator==(media_type_t const&, media_type_t const&);
+
+  bool
+  operator!=(media_type_t const&, media_type_t const&);
+
+  std::ostream&
+  to_stream(std::ostream&, media_type_t const&);
+
+  std::string
+  to_string(media_type_t const&);
+
+  std::ostream&
+  operator<<(std::ostream&, media_type_t const&);
+
+} // namespace code::seafire::protocol
+
+#include <code/seafire/protocol/media-type.txx>
+
+#endif

code/seafire/protocol/media-type.txx

@@ -0,0 +1,125 @@
+namespace code::seafire::protocol
+{
+
+  template<typename InputIterator>
+  std::optional<media_type_t>
+  media_type_t::
+  try_parse(InputIterator& begin,
+            InputIterator const& end,
+            std::error_code& ec)
+  {
+    std::optional<media_type_t> const failure;
+
+    auto skip_whitespace = [&]
+    {
+      while (begin != end && grammar::is_space(*begin)) {
+        ++begin;
+      }
+    };
+
+    auto try_parse_token = [&]() -> std::optional<std::string>
+    {
+      if (begin == end)
+        return std::nullopt;
+
+      if (!grammar::is_tchar(*begin))
+        return std::nullopt;
+
+      std::string token;
+      token += *begin;
+      ++begin;
+
+      while (begin != end) {
+        if (!grammar::is_tchar(*begin))
+          break;
+
+        token += *begin;
+        ++begin;
+      }
+
+      return std::move(token);
+    };
+
+    auto try_parse_parameter = [&]() -> std::optional<std::pair<std::string, std::string>>
+    {
+      if (begin == end || *begin != ';')
+        return std::nullopt;
+
+      ++begin; // skips ';'
+
+      skip_whitespace();
+
+      auto name = try_parse_token();
+
+      if (!name || begin == end || *begin != '=')
+        return std::nullopt;
+
+      ++begin; // skips '='
+
+      // Quoted-string value?
+      if (begin != end && *begin == '"') {
+        // fixme: support quoted string values
+        //
+        return std::nullopt;
+      }
+
+      auto value = try_parse_token();
+
+      if (!value)
+        return std::nullopt;
+
+      // fixme: normalize parameter name.
+      //
+
+      return std::pair<std::string, std::string >{*name, *value};
+    };
+
+    auto try_parse_parameters = [&]() -> std::map<std::string, std::string>
+    {
+      std::map< std::string, std::string > params;
+
+      while (begin != end) {
+        auto param = try_parse_parameter();
+
+        if (!param) {
+          return params;
+        }
+
+        params.insert(*param);
+
+        skip_whitespace();
+      }
+
+      return params;
+    };
+
+    skip_whitespace();
+
+    auto type = try_parse_token();
+
+    if (!type) {
+      return std::nullopt;
+    }
+
+    if (begin == end || *begin != '/') {
+      return std::nullopt;
+    }
+
+    ++begin; // skips '/'
+
+    auto subtype = try_parse_token();
+
+    if (!subtype) {
+      return std::nullopt;
+    }
+
+    skip_whitespace();
+
+    return {{
+      std::move(*type),
+      std::move(*subtype),
+      try_parse_parameters()
+    }};
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/message.cxx

@@ -0,0 +1,89 @@
+#include <code/seafire/protocol/message.hxx>
+
+namespace code::seafire::protocol
+{
+
+  /// Construct a new message.
+  ///
+  message_t::
+  message_t() = default;
+
+  /// Construct a new message.
+  ///
+  message_t::
+  message_t(version_t version)
+    : version_{version}
+  {}
+
+  /// Get the message version.
+  ///
+  version_t const&
+  message_t::
+  version() const
+  {
+    return version_;
+  }
+
+  /// Set the message version.
+  ///
+  void
+  message_t::
+  set_version(version_t v)
+  {
+    version_ = std::move(v);
+  }
+
+  /// Access the message headers.
+  ///
+  header_collection_t const&
+  message_t::
+  headers() const
+  {
+    return headers_;
+  }
+
+  /// Set/replace message header.
+  ///
+  void
+  message_t::
+  set_header(std::string name, std::string value)
+  {
+    headers_.set(std::move(name), std::move(value));
+  }
+
+  /// Append message header.
+  ///
+  void
+  message_t::
+  append_header(std::string name, std::string value)
+  {
+    headers_.append(std::move(name), std::move(value));
+  }
+
+  /// Erase message header.
+  ///
+  void
+  message_t::
+  erase_header(std::string name)
+  {
+    headers_.erase(name);
+  }
+
+  /// Set/replace message headers.
+  ///
+  void
+  message_t::
+  set_headers(header_collection_t headers)
+  {
+    headers_ = std::move(headers);
+  }
+
+  /// Write headers to output stream.
+  ///
+  std::ostream&
+  operator<<(std::ostream& o, message_t const& m)
+  {
+    return o << m.headers();
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/message.hxx

@@ -0,0 +1,86 @@
+#ifndef code__seafire__protocol__message_hxx_
+#define code__seafire__protocol__message_hxx_
+
+#include <code/seafire/protocol/header-collection.hxx>
+#include <code/seafire/protocol/protocol-version.hxx>
+#include <code/seafire/protocol/traits.hxx>
+
+#include <optional>
+#include <ostream>
+
+namespace code::seafire::protocol
+{
+
+  /// Common base class for HTTP messages.
+  ///
+  class message_t
+  {
+  public:
+    message_t();
+
+    explicit
+    message_t(version_t);
+
+    version_t const&
+    version() const;
+
+    void
+    set_version(version_t);
+
+    header_collection_t const&
+    headers() const;
+
+    void
+    set_headers(header_collection_t);
+
+    void
+    set_header(std::string, std::string);
+
+    void
+    append_header(std::string, std::string);
+
+    void
+    erase_header(std::string);
+
+  private:
+    version_t version_;
+    header_collection_t headers_;
+
+  };
+
+  template<typename Header>
+  bool
+  has(message_t const& m);
+
+  template<typename Header>
+  bool
+  has_quick(message_t const& m);
+
+  template<typename Header>
+  std::optional<traits::alias_type_t<Header>>
+  get(message_t const& m);
+
+  template<typename Header>
+  std::optional<traits::alias_type_t<Header>>
+  get(message_t const& m, std::error_code& ec);
+
+  template<typename Header, typename... Args>
+  void
+  set(message_t& m, Args&&... args);
+
+  template<typename Header, typename... Args>
+  void
+  set_if_not_set(message_t& m, Args&&... args);
+
+  template<typename Header>
+  void
+  erase(message_t& m);
+
+  std::ostream&
+  operator<<(std::ostream& o, message_t const& m);
+
+} // namespace code::seafire::protocol
+
+#include <code/seafire/protocol/message.txx>
+
+#endif

code/seafire/protocol/message.txx

@@ -0,0 +1,66 @@
+namespace code::seafire::protocol
+{
+
+  template<typename H>
+  bool
+  has(message_t const& m)
+  {
+    // FIXME: Parse header as well, to make sure it is valid.
+    return m.headers().contains(H::name);
+  }
+
+  template<typename H>
+  bool
+  has_quick(message_t const& m)
+  {
+    return m.headers().contains(H::name);
+  }
+
+  template<typename H>
+  std::optional<traits::alias_type_t<H>>
+  get(message_t const& m)
+  {
+    std::error_code ignored_ec;
+    return get<H>(m, ignored_ec);
+  }
+
+  template<typename H>
+  std::optional<traits::alias_type_t<H>>
+  get(message_t const& m, std::error_code& ec)
+  {
+    return H::try_parse(m.headers().get(H::name), ec);
+  }
+
+  template<typename H, typename... Args>
+  void
+  set(message_t& m, Args&&... args)
+  {
+    using type = traits::alias_type_t<H>;
+
+    if constexpr (traits::has_overridden_to_string_v<H>) {
+      m.set_header(H::name, H::to_string(type{std::forward<Args>(args)...}));
+    }
+    else {
+      using std::to_string;
+      m.set_header(H::name, to_string(type{std::forward<Args>(args)...}));
+    }
+  }
+
+  template<typename H, typename... Args>
+  void
+  set_if_not_set(message_t& m, Args&&... args)
+  {
+    if (has_quick<H>())
+      return;
+
+    set<H>(m, std::forward<Args>(args)...);
+  }
+
+  template<typename H>
+  void
+  erase(message_t& m)
+  {
+    m.erase_header(H::name);
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/protocol-version.cxx

@@ -0,0 +1,71 @@
+#include <code/seafire/protocol/protocol-version.hxx>
+
+#include <sstream>
+
+namespace code::seafire::protocol
+{
+
+  bool
+  version_t::
+  operator==(version_t const& other) const noexcept
+  {
+    return major == other.major && minor == other.minor;
+  }
+
+  bool
+  version_t::
+  operator!=(version_t const& other) const noexcept
+  {
+    return !(*this == other);
+  }
+
+  std::ostream&
+  to_stream(std::ostream& o, version_t const& v)
+  {
+    o << "HTTP/" << v.major << '.' << v.minor;
+    return o;
+  }
+
+  std::string
+  to_string(version_t const& v)
+  {
+    std::stringstream str;
+    to_stream(str, v);
+    return str.str();
+  }
+
+  std::ostream&
+  operator<<(std::ostream& o, version_t const& v)
+  {
+    return to_stream(o, v);
+  }
+
+  void
+  to_buffers(common::io::const_buffers_t& buffers, version_t const& v)
+  {
+    static char constexpr http10[]{'H', 'T', 'T', 'P', '/', '1', '.', '0'};
+    static char constexpr http11[]{'H', 'T', 'T', 'P', '/', '1', '.', '1'};
+
+    static char constexpr http[]{'H', 'T', 'T', 'P', '/'};
+    static char constexpr digits[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
+    static char constexpr dot[]{'.'};
+
+    using common::io::buffer;
+
+    if (v == http_1_0) {
+      buffers.emplace_back(buffer(http10));
+      return;
+    }
+
+    if (v == http_1_1) {
+      buffers.emplace_back(buffer(http11));
+      return;
+    }
+
+    buffers.emplace_back(buffer(http));
+    buffers.emplace_back(buffer(&digits[v.major % 10], 1));
+    buffers.emplace_back(buffer(dot));
+    buffers.emplace_back(buffer(&digits[v.minor % 10], 1));
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/protocol-version.hxx

@@ -0,0 +1,66 @@
+#ifndef code__seafire__protocol__protocol_version_hxx_
+#define code__seafire__protocol__protocol_version_hxx_
+
+#include <code/seafire/common/io/buffer.hxx>
+
+#include <asio.hpp>
+
+#include <cstdint>
+#include <ostream>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol
+{
+
+  /// Represents an HTTP version.
+  ///
+  struct version_t
+  {
+    /// Construct a new protocol version.
+    ///
+    constexpr
+    version_t() noexcept
+      : major{0}, minor{0}
+    {}
+
+    /// Construct a new protocol version.
+    ///
+    /// \param major The major version number.
+    /// \param minor The minor version number.
+    ///
+    constexpr
+    version_t(std::uint16_t major, std::uint16_t minor) noexcept
+      : major{major}, minor{minor}
+    {}
+
+    bool
+    operator==(version_t const&) const noexcept;
+
+    bool
+    operator!=(version_t const&) const noexcept;
+
+    std::uint16_t major;
+    std::uint16_t minor;
+
+  };
+
+  inline constexpr version_t const http_1_0{1, 0};
+
+  inline constexpr version_t const http_1_1{1, 1};
+
+  std::ostream&
+  to_stream(std::ostream&, version_t const&);
+
+  std::string
+  to_string(version_t const&);
+
+  std::ostream&
+  operator<<(std::ostream&, version_t const&);
+
+  void
+  to_buffers(common::io::const_buffers_t&, version_t const&);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/read-content.cxx

@@ -0,0 +1,225 @@
+#include <code/seafire/protocol/read-content.hxx>
+
+#include <code/seafire/protocol/rfc7230/content-length.hxx>
+
+namespace code::seafire::protocol
+{
+
+  void
+  read_content(common::io::stream_t& s,
+               asio::streambuf& i,
+               asio::streambuf& c,
+               std::size_t content_length)
+  {
+    std::error_code ec;
+    read_content(s, i, c, content_length, ec);
+
+    if (ec) {
+      throw std::system_error{ec};
+    }
+  }
+
+  void
+  read_content(common::io::stream_t& s,
+               asio::streambuf& i,
+               asio::streambuf& c,
+               std::size_t content_length,
+               std::error_code& ec)
+  {
+    if (auto pending = i.size(); pending > 0) {
+      auto copied = buffer_copy(
+        c.prepare(pending),
+        i.data(),
+        std::min<std::size_t>(pending, content_length)
+      );
+      i.consume(copied);
+      c.commit(copied);
+      content_length -= copied;
+    }
+
+    auto n = s.read(c.prepare(content_length), ec);
+    c.commit(n);
+  }
+
+  void
+  async_read_content(common::io::stream_t& s,
+                     asio::streambuf& i,
+                     asio::streambuf& c,
+                     std::size_t content_length,
+                     std::function<void(std::error_code)> h)
+  {
+    if (auto pending = i.size(); pending > 0) {
+      auto copied = buffer_copy(
+        c.prepare(pending),
+        i.data(),
+        std::min<std::size_t>(pending, content_length)
+      );
+
+      i.consume(copied);
+      c.commit(copied);
+      content_length -= copied;
+    }
+
+    auto bound = [&c, h](std::error_code const& ec, std::size_t n)
+    {
+      c.commit(n);
+      h(ec);
+    };
+
+    s.async_read(c.prepare(content_length), bound);
+  }
+
+  /// Read content from stream.
+  ///
+  void
+  read_content(common::io::stream_t& s,
+               asio::streambuf& i,
+               asio::streambuf& c,
+               request_t const& r)
+  {
+    std::error_code ec;
+    read_content(s, i, c, r, ec);
+
+    if (ec) {
+      throw std::system_error{ec};
+    }
+  }
+
+  void
+  read_content(common::io::stream_t& s,
+               asio::streambuf& i,
+               asio::streambuf& c,
+               request_t const& r,
+               std::error_code& ec)
+  {
+    // fixme: support transfer encoding.
+    //
+
+    auto content_length = get<rfc7230::content_length_t>(r, ec);
+
+    if (ec) {
+      return;
+    }
+
+    if (content_length) {
+      read_content(s, i, c, *content_length, ec);
+      return;
+    }
+
+    // we just assume the message does not contain a payload.
+    //
+  }
+
+  void
+  async_read_content(common::io::stream_t& s,
+                     asio::streambuf& i,
+                     asio::streambuf& c,
+                     request_t const& r,
+                     std::function<void(std::error_code)> handler)
+  {
+    std::error_code ec;
+    auto content_length = get<rfc7230::content_length_t>(r, ec);
+
+    if (ec) {
+      asio::post(
+        s.get_executor(),
+        [handler, ec]()
+        {
+          handler(ec);
+        }
+      );
+      return;
+    }
+
+    if (content_length) {
+      async_read_content(s, i, c, *content_length, handler);
+      return;
+    }
+
+    // we assume the request does not include a payload.
+    //
+    asio::post(
+      s.get_executor(),
+      [handler]
+      {
+        handler({});
+      }
+    );
+  }
+
+  void
+  read_content(common::io::stream_t& s,
+               asio::streambuf& i,
+               asio::streambuf& c,
+               response_t const& r)
+  {
+    std::error_code ec;
+    read_content(s, i, c, r, ec);
+
+    if (ec) {
+      throw std::system_error{ec};
+    }
+  }
+
+  void
+  read_content(common::io::stream_t& s,
+               asio::streambuf& i,
+               asio::streambuf& c,
+               response_t const& r,
+               std::error_code& ec)
+  {
+    // fixme: support transfer encoding.
+    //
+
+    auto content_length = get<rfc7230::content_length_t>(r, ec);
+
+    if (ec) {
+      return;
+    }
+
+    if (content_length) {
+      read_content(s, i, c, *content_length, ec);
+      return;
+    }
+
+    // fixme: read until eof.
+    //
+    // fixme: return error until eof is implemented.
+    //
+  }
+
+  void
+  async_read_content(common::io::stream_t& s,
+                     asio::streambuf& i,
+                     asio::streambuf& c,
+                     response_t const& r,
+                     std::function<void(std::error_code)> handler)
+  {
+    // fixme: support transfer encoding.
+    //
+
+    std::error_code ec;
+    auto content_length = get<rfc7230::content_length_t>(r, ec);
+
+    if (ec) {
+      asio::post(
+        s.get_executor(),
+        [handler, ec]
+        {
+          handler(ec);
+        }
+      );
+    }
+
+    if (content_length) {
+      async_read_content(s, i, c, *content_length, handler);
+      return;
+    }
+
+    // fixme: read until eof.
+    //
+    // fixme: return error until eof is implemented.
+    //
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/read-content.hxx

@@ -0,0 +1,74 @@
+#ifndef code__seafire__protocol__read_content_hxx_
+#define code__seafire__protocol__read_content_hxx_
+
+#include <code/seafire/protocol/request.hxx>
+#include <code/seafire/protocol/response.hxx>
+
+#include <code/seafire/common/io/stream.hxx>
+
+namespace code::seafire::protocol
+{
+
+  void
+  read_content(common::io::stream_t&,
+               asio::streambuf&,
+               asio::streambuf&,
+               std::size_t);
+
+  void
+  read_content(common::io::stream_t&,
+               asio::streambuf&,
+               asio::streambuf&,
+               std::size_t,
+               std::error_code&);
+
+  void
+  async_read_content(common::io::stream_t&,
+                     asio::streambuf&,
+                     asio::streambuf&,
+                     std::size_t,
+                     std::function<void(std::error_code)>);
+
+  void
+  read_content(common::io::stream_t&,
+               asio::streambuf&,
+               asio::streambuf&,
+               request_t const&);
+
+  void
+  read_content(common::io::stream_t&,
+               asio::streambuf&,
+               asio::streambuf&,
+               request_t const&,
+               std::error_code&);
+
+  void
+  async_read_content(common::io::stream_t&,
+                     asio::streambuf&,
+                     asio::streambuf&,
+                     request_t const&,
+                     std::function<void(std::error_code)>);
+
+  void
+  read_content(common::io::stream_t&,
+               asio::streambuf&,
+               asio::streambuf&,
+               response_t const&);
+
+  void
+  read_content(common::io::stream_t&,
+               asio::streambuf&,
+               asio::streambuf&,
+               response_t const&,
+               std::error_code&);
+
+  void
+  async_read_content(common::io::stream_t&,
+                     asio::streambuf&,
+                     asio::streambuf&,
+                     response_t const&,
+                     std::function<void(std::error_code)>);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/read.cxx

@@ -0,0 +1,171 @@
+#include <code/seafire/protocol/read.hxx>
+#include <code/seafire/protocol/match.hxx>
+
+#include <code/seafire/protocol/rfc7230/content-length.hxx>
+
+#include <code/seafire/common/io/read-until.hxx>
+
+#include <asio.hpp>
+
+namespace code::seafire::protocol
+{
+
+  /// Read a request message from buffer \a b, reading more content from
+  /// stream \a s as required.
+  ///
+  /// The read request message is placed in \a r.
+  ///
+  /// If the buffer \a b contains a full request message, no I/O operations
+  /// will be performed.
+  ///
+  /// \throws std::system_error Thrown on error.
+  /// \relatesalso request_t
+  ///
+  void
+  read(common::io::stream_t& s,
+       asio::streambuf& b,
+       request_t& r)
+  {
+    std::error_code ec;
+    read(s, b, r, ec);
+
+    if (ec) {
+      throw std::system_error{ec};
+    }
+  }
+
+  /// Read a request message from buffer \a b, reading more content from
+  /// stream \a s as required.
+  ///
+  /// The read request message is placed in \a r.
+  ///
+  /// If the buffer \a b contains a full request message, no I/O operations
+  /// will be performed.
+  ///
+  /// Errors are reported through \a ec.
+  ///
+  /// \relatesalso request_t
+  ///
+  void
+  read(common::io::stream_t& s,
+       asio::streambuf& b,
+       request_t& r,
+       std::error_code& ec)
+  {
+    auto bytes_consumed = common::io::read_until(s, b, match_request_t{r}, ec);
+
+    if (ec) {
+      return;
+    }
+
+    b.consume(bytes_consumed);
+  }
+
+  /// Initialize an asynchronous read of a request message from buffer \a b,
+  /// reading more content from \a s as required.
+  ///
+  /// The read request message is placed in \a r.
+  ///
+  /// If the buffer \a b contains a full request message, no I/O operations
+  /// will be performed.
+  ///
+  /// \a r must be valid until the completion-handler \a h is called.
+  ///
+  void
+  async_read(common::io::stream_t& s,
+             asio::streambuf& b,
+             request_t& r,
+             std::function<void(std::error_code)> h)
+  {
+    auto bound = [&b, h](std::error_code const& ec, std::size_t n)
+    {
+      if (!ec) {
+        b.consume(n);
+      }
+
+      h(ec);
+    };
+
+    common::io::async_read_until(s, b, match_request_t{r}, bound);
+  }
+
+  /// Read a response message from buffer \a b, reading more content from
+  /// stream \a s as required.
+  ///
+  /// The read response message is placed in \a r.
+  ///
+  /// If the buffer \a b contains a full response message, no I/O operations
+  /// will be performed.
+  ///
+  /// \throws std::system_error Thrown on error.
+  /// \relatesalso response_t
+  ///
+  void
+  read(common::io::stream_t& s,
+       asio::streambuf& b,
+       response_t& r)
+  {
+    std::error_code ec;
+    read(s, b, r, ec);
+
+    if (ec) {
+      throw std::system_error{ec};
+    }
+  }
+
+  /// Read a response message from buffer \a b, reading more content from
+  /// stream \a s as required.
+  ///
+  /// The read response message is placed in \a r.
+  ///
+  /// If the buffer \a b contains a full response message, no I/O operations
+  /// will be performed.
+  ///
+  /// Errors are reported through \a ec.
+  ///
+  /// \relatesalso response_t
+  ///
+  void
+  read(common::io::stream_t& s,
+       asio::streambuf& b,
+       response_t& r,
+       std::error_code& ec)
+  {
+    auto bytes_consumed = common::io::read_until(s, b, match_response_t{r}, ec);
+
+    if (ec) {
+      return;
+    }
+
+    b.consume(bytes_consumed);
+  }
+
+  /// Initialize an asynchronous read of a response message from buffer \a b,
+  /// reading more content from \a s as required.
+  ///
+  /// The read response message is placed in \a r.
+  ///
+  /// If the buffer \a b contains a full response message, no I/O operations
+  /// will be performed.
+  ///
+  /// \a r must be valid until the completion-handler \a h is called.
+  ///
+  void
+  async_read(common::io::stream_t& s,
+             asio::streambuf& b,
+             response_t& r,
+             std::function<void(std::error_code)> h)
+  {
+    auto bound = [&b, h](std::error_code const& ec, std::size_t n)
+    {
+      if (!ec) {
+        b.consume(n);
+      }
+
+      h(ec);
+    };
+
+    common::io::async_read_until(s, b, match_response_t{r}, bound);
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/read.hxx

@@ -0,0 +1,54 @@
+#ifndef code__seafire__protocol__read_hxx_
+#define code__seafire__protocol__read_hxx_
+
+#include <code/seafire/protocol/message.hxx>
+#include <code/seafire/protocol/request.hxx>
+#include <code/seafire/protocol/response.hxx>
+
+#include <code/seafire/common/io/stream.hxx>
+
+#include <asio.hpp>
+
+#include <cstddef>
+#include <system_error>
+
+namespace code::seafire::protocol
+{
+
+  void
+  read(common::io::stream_t&,
+       asio::streambuf&,
+       request_t&);
+
+  void
+  read(common::io::stream_t&,
+       asio::streambuf&,
+       request_t&,
+       std::error_code&);
+
+  void
+  async_read(common::io::stream_t&,
+             asio::streambuf&,
+             request_t&,
+             std::function<void(std::error_code)>);
+
+  void
+  read(common::io::stream_t&,
+       asio::streambuf&,
+       response_t&);
+
+  void
+  read(common::io::stream_t&,
+       asio::streambuf&,
+       response_t&,
+       std::error_code&);
+
+  void
+  async_read(common::io::stream_t&,
+             asio::streambuf&,
+             response_t&,
+             std::function<void(std::error_code)>);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/reason.cxx

@@ -0,0 +1,56 @@
+#include <code/seafire/protocol/reason.hxx>
+
+namespace code::seafire::protocol
+{
+
+  char const*
+  get_reason(unsigned short code)
+  {
+    switch (code) {
+      case 100: return "Continue";
+      case 101: return "Switching Protocols";
+      case 200: return "OK";
+      case 201: return "Created";
+      case 202: return "Accepted";
+      case 203: return "Non-Authoritative Information";
+      case 204: return "No Content";
+      case 205: return "Reset Content";
+      case 300: return "Multiple Choices";
+      case 301: return "Moved Permanently";
+      case 302: return "Found";
+      case 303: return "See Other";
+      case 304: return "Not Modified"; // rfc7232
+      case 307: return "Temporary Redirect";
+      case 400: return "Bad Request";
+      case 401: return "Unauthorized"; // rc7235
+      case 402: return "Payment Required";
+      case 403: return "Forbidden";
+      case 404: return "Not Found";
+      case 405: return "Method Not Allowed";
+      case 406: return "Not Acceptable";
+      case 407: return "Proxy Authentication Required"; // rc7235
+      case 408: return "Request Timeout";
+      case 409: return "Conflict";
+      case 410: return "Gone";
+      case 411: return "Length Required";
+      case 412: return "Precondition Failed"; // rfc7232
+      case 413: return "Payload Too Large";
+      case 414: return "URI Too Long";
+      case 415: return "Unsupported Media Type";
+      case 417: return "Expectation Failed";
+      case 426: return "Upgrade Required";
+      case 500: return "Internal Server Error";
+      case 501: return "Not Implemented";
+      case 502: return "Bad Gateway";
+      case 503: return "Service Unavailable";
+      case 504: return "Gateway Timeout";
+      case 505: return "HTTP Version Not Supported";
+
+      // Unofficial.
+      case 420: return "Enhance Your Calm";
+    }
+
+    return "Unknown";
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/reason.hxx

@@ -0,0 +1,12 @@
+#ifndef code__seafire__protocol__reason_hxx_
+#define code__seafire__protocol__reason_hxx_
+
+namespace code::seafire::protocol
+{
+
+  char const*
+  get_reason(unsigned short);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/request.cxx

@@ -0,0 +1,149 @@
+#include <code/seafire/protocol/request.hxx>
+
+#include <asio.hpp>
+
+namespace code::seafire::protocol
+{
+
+  /// Construct a new request message.
+  ///
+  request_t::
+  request_t()
+  {}
+
+  /// Construct a new request message.
+  ///
+  /// \param method The method of the request message.
+  /// \param target The target of the request message.
+  /// \param version The version of the request message.
+  ///
+  request_t::
+  request_t(std::string method,
+          std::string target,
+          version_t version)
+  {
+    set_method(std::move(method));
+    set_target(std::move(target));
+    set_version(version);
+  }
+
+  /// Access the method of the request message.
+  ///
+  std::string const&
+  request_t::
+  method() const
+  {
+    return method_;
+  }
+
+  /// Set the method of the request message.
+  ///
+  void
+  request_t::
+  set_method(std::string method)
+  {
+    method_ = std::move(method);
+  }
+
+  /// Access the target of the request message.
+  ///
+  std::string const&
+  request_t::
+  target() const
+  {
+    return target_;
+  }
+
+  /// Set the target of the request message.
+  ///
+  void
+  request_t::
+  set_target(std::string target)
+  {
+    target_ = std::move(target);
+  }
+
+  /// Access the target of the request as a URI.
+  ///
+  uri::uri_t const&
+  request_t::
+  target_uri() const
+  {
+    return target_uri_;
+  }
+
+  /// Set the target URI of the request message.
+  ///
+  void
+  request_t::
+  set_target_uri(uri::uri_t target_uri)
+  {
+    target_uri_ = std::move(target_uri);
+  }
+
+  /// Convert an HTTP request message to byte buffers.
+  ///
+  /// The buffers are invalidated when the request message is destroyed
+  /// or any of its properties are modified.
+  ///
+  /// The buffers are added to the \a buffers vector.
+  ///
+  /// \relatesalso request_t
+  ///
+  void
+  to_buffers(common::io::const_buffers_t& buffers, request_t const& r)
+  {
+    static char const colon_space[]{ ':', ' ' };
+    static char const crlf[]{ '\r', '\n' };
+    static char const space[]{ ' ' };
+
+    using common::io::buffer;
+
+    buffers.emplace_back(buffer(r.method()));
+    buffers.emplace_back(buffer(space));
+    buffers.emplace_back(buffer(r.target()));
+    buffers.emplace_back(buffer(space));
+
+    to_buffers(buffers, r.version());
+    buffers.emplace_back(buffer(crlf));
+
+    for (auto const& header : r.headers()) {
+      buffers.emplace_back(buffer(header.first));
+      buffers.emplace_back(buffer(colon_space));
+      buffers.emplace_back(buffer(header.second));
+      buffers.emplace_back(buffer(crlf));
+    }
+
+    buffers.emplace_back(buffer(crlf));
+  }
+
+  /// Convert an HTTP request message to byte buffers.
+  ///
+  /// The buffers are invalidated when the request message is destroyed
+  /// or any of its properties are modified.
+  ///
+  /// The buffers are returned as an array of buffers.
+  ///
+  /// \relatesalso request_t
+  ///
+  common::io::const_buffers_t
+  to_buffers(request_t const& r)
+  {
+    common::io::const_buffers_t buffers;
+    to_buffers(buffers, r);
+    return buffers;
+  }
+
+  /// Write a request message to an output stream.
+  ///
+  /// \relatesalso request_t
+  ///
+  std::ostream&
+  operator<<(std::ostream& o, request_t const& r)
+  {
+    o << r.method() << ' ' << r.target() << ' ' << r.version() << '\n';
+    o << static_cast<message_t const&>(r);
+    return o;
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/request.hxx

@@ -0,0 +1,62 @@
+#ifndef code__seafire__protocol__request_hxx_
+#define code__seafire__protocol__request_hxx_
+
+#include <code/seafire/protocol/message.hxx>
+
+#include <code/seafire/common/io/buffer.hxx>
+
+#include <code/uri/uri.hxx>
+
+#include <ostream>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol
+{
+
+  class request_t
+    : public message_t
+  {
+  public:
+    request_t();
+
+    request_t(std::string, std::string, version_t);
+
+    std::string const&
+    method() const;
+
+    void
+    set_method(std::string);
+
+    std::string const&
+    target() const;
+
+    void
+    set_target(std::string);
+
+    uri::uri_t const&
+    target_uri() const;
+
+    void
+    set_target_uri(uri::uri_t);
+
+  private:
+    std::string method_;
+    std::string target_;
+    uri::uri_t target_uri_;
+    std::string query_;
+
+  };
+
+  void
+  to_buffers(common::io::const_buffers_t&, request_t const&);
+
+  common::io::const_buffers_t
+  to_buffers(request_t const&);
+
+  std::ostream&
+  operator<<(std::ostream&, request_t const&);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/response.cxx

@@ -0,0 +1,101 @@
+#include <code/seafire/protocol/response.hxx>
+
+#include <asio.hpp>
+
+namespace code::seafire::protocol
+{
+
+  /// Construct a new response message.
+  ///
+  response_t::
+  response_t() = default;
+
+  /// Construct a new response message.
+  ///
+  /// \param version The HTTP version of this response message.
+  /// \param status  The HTTP status of this response message.
+  ///
+  response_t::
+  response_t(version_t version, status_code_t status)
+    : message_t{version},
+      status_{status}
+  {}
+
+  /// Access the message status.
+  ///
+  status_code_t const&
+  response_t::
+  status() const
+  {
+    return status_;
+  }
+
+  /// Set the message status.
+  ///
+  void
+  response_t::
+  set_status(status_code_t status)
+  {
+    status_ = std::move(status);
+  }
+
+  /// Convert an HTTP response message to byte buffers.
+  ///
+  /// The buffers are invalidated when the response message is destroyed
+  /// or any of its properties are modified.
+  ///
+  /// The buffers are added to the \a buffers vector.
+  ///
+  /// \relatesalso response_t
+  ///
+  void
+  to_buffers(common::io::const_buffers_t& buffers, response_t const& r)
+  {
+    static char const colon_space[]{':', ' '};
+    static char const crlf[]{'\r', '\n'};
+    static char const digits[]{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
+    static char const space[]{' '};
+
+    using common::io::buffer;
+
+    to_buffers(buffers, r.version());
+    buffers.emplace_back(buffer(space));
+
+    auto code = r.status();
+
+    buffers.emplace_back(buffer(&digits[code / 100], 1));
+    buffers.emplace_back(buffer(&digits[code % 100 / 10], 1));
+    buffers.emplace_back(buffer(&digits[code % 10], 1));
+    buffers.emplace_back(buffer(" ", 1));
+
+    buffers.emplace_back(buffer(r.status().reason()));
+    buffers.emplace_back(buffer(crlf));
+
+    for (auto const& header : r.headers()) {
+      buffers.emplace_back(buffer(header.first));
+      buffers.emplace_back(buffer(colon_space));
+      buffers.emplace_back(buffer(header.second));
+      buffers.emplace_back(buffer(crlf));
+    }
+
+    buffers.emplace_back(buffer(crlf));
+  }
+
+  /// Convert an HTTP response message to byte buffers.
+  ///
+  /// The buffers are invalidated when the response message is destroyed
+  /// or any of its properties are modified.
+  ///
+  /// The buffers are returned as an array of buffers.
+  ///
+  /// \relatesalso response_t
+  ///
+  common::io::const_buffers_t
+  to_buffers(response_t const& r)
+  {
+    common::io::const_buffers_t buffers;
+    to_buffers(buffers, r);
+    return buffers;
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/response.hxx

@@ -0,0 +1,44 @@
+#ifndef code__seafire__protocol__response_hxx_
+#define code__seafire__protocol__response_hxx_
+
+#include <code/seafire/protocol/message.hxx>
+#include <code/seafire/protocol/status-code.hxx>
+
+#include <code/seafire/common/io/buffer.hxx>
+
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol
+{
+
+  /// Represents an HTTP/1.1 response message.
+  ///
+  class response_t
+    : public message_t
+  {
+  public:
+    response_t();
+
+    response_t(version_t, status_code_t);
+
+    status_code_t const&
+    status() const;
+
+    void
+    set_status(status_code_t status);
+
+  private:
+    status_code_t status_;
+
+  };
+
+  void
+  to_buffers(common::io::const_buffers_t&, response_t const&);
+
+  common::io::const_buffers_t
+  to_buffers(response_t const&);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/rfc7230/connection.cxx

@@ -0,0 +1,88 @@
+#include <code/seafire/protocol/rfc7230/connection.hxx>
+
+namespace code::seafire::protocol::rfc7230
+{
+
+  connection_t::
+  connection_t(std::set<token_t> tokens)
+    : tokens_{std::move(tokens)}
+  {}
+
+  connection_t::
+  connection_t(std::initializer_list<token_t> tokens)
+    : tokens_{tokens.begin(), tokens.end()}
+  {}
+
+  std::set<token_t> const&
+  connection_t::
+  tokens() const
+  {
+    return tokens_;
+  }
+
+  bool
+  connection_t::
+  close() const
+  {
+    return tokens().find("close") != tokens().end();
+  }
+
+  bool
+  connection_t::
+  keep_alive() const
+  {
+    return tokens().find("keep-alive") != tokens().end();
+  }
+
+  bool
+  connection_t::
+  upgrade() const
+  {
+    return tokens().find("upgrade") != tokens().end();
+  }
+
+  std::optional<connection_t>
+  connection_t::
+  try_parse(std::vector<std::string> const& strings, std::error_code&)
+  {
+    std::set<token_t> tokens;
+
+    for (auto const& j : strings) {
+      auto begin = j.begin();
+      auto end = j.end();
+
+      auto t = try_parse_tokens(begin, end);
+
+      if (!t) {
+        return std::nullopt;
+      }
+
+      if (begin != end) {
+        return std::nullopt;
+      }
+
+      for (auto const& k : *t) {
+        tokens.emplace(k);
+      }
+    }
+
+    return std::set<token_t>{tokens.begin(), tokens.end()};
+  }
+
+  std::string
+  to_string(connection_t const& c)
+  {
+    std::string joined;
+
+    for (auto const& j : c.tokens()) {
+      if (!joined.empty()) {
+        joined.append(", ");
+      }
+
+      joined.append(j.str());
+    }
+
+    return joined;
+  }
+
+} // namespace code::seafire::protocol::rfc7230

code/seafire/protocol/rfc7230/connection.hxx

@@ -0,0 +1,51 @@
+#ifndef code__seafire__protocol__rfc7230__connection_hxx_
+#define code__seafire__protocol__rfc7230__connection_hxx_
+
+#include <code/seafire/protocol/token.hxx>
+
+#include <initializer_list>
+#include <set>
+#include <string>
+#include <system_error>
+
+namespace code::seafire::protocol::rfc7230
+{
+
+  /// Represents the HTTP `connection` header.
+  ///
+  class connection_t
+  {
+  public:
+    static constexpr char const name[] = "connection";
+
+    connection_t(std::set<token_t>);
+
+    connection_t(std::initializer_list<token_t>);
+
+    std::set<token_t> const&
+    tokens() const;
+
+    bool
+    close() const;
+
+    bool
+    keep_alive() const;
+
+    bool
+    upgrade() const;
+
+    static
+    std::optional<connection_t>
+    try_parse(std::vector<std::string> const&, std::error_code&);
+
+  private:
+    std::set<token_t> tokens_;
+
+  };
+
+  std::string
+  to_string(connection_t const&);
+
+} // namespace code::seafire::protocol::rfc7230
+
+#endif

code/seafire/protocol/rfc7230/content-length.cxx

@@ -0,0 +1,28 @@
+#include <code/seafire/protocol/rfc7230/content-length.hxx>
+
+#include <code/seafire/protocol/error.hxx>
+
+namespace code::seafire::protocol::rfc7230
+{
+
+  std::optional<std::size_t>
+  content_length_t::
+  try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+  {
+    if (strings.size() == 1) {
+      try {
+        return std::stoull(strings[0]);
+      }
+      catch (...) {
+        ec = protocol_error_t::invalid_content_length;
+        return std::nullopt;
+      }
+    }
+    else if (strings.size() > 1) {
+      ec = protocol_error_t::invalid_content_length;
+    }
+
+    return std::nullopt;
+  }
+
+} // namespace code::seafire::protocol::rfc7230

code/seafire/protocol/rfc7230/content-length.hxx

@@ -0,0 +1,29 @@
+#ifndef code__seafire__protocol__rfc7230__content_length_hxx_
+#define code__seafire__protocol__rfc7230__content_length_hxx_
+
+#include <cstddef>
+#include <cstdint>
+#include <optional>
+#include <string>
+#include <system_error>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7230
+{
+
+  // fixme: make class
+  struct content_length_t
+  {
+    using alias_type = std::uint64_t;
+
+    static constexpr char const name[] = "content-length";
+
+    static
+    std::optional<std::size_t>
+    try_parse(std::vector<std::string> const&, std::error_code&);
+
+  };
+
+} // namespace code::seafire::protocol::rfc7230
+
+#endif

code/seafire/protocol/rfc7230/host.cxx

@@ -0,0 +1,95 @@
+#include <code/seafire/protocol/rfc7230/host.hxx>
+
+#include <code/uri/grammar.hxx>
+
+namespace code::seafire::protocol::rfc7230
+{
+
+  host_t::
+  host_t(std::string hostname)
+    : hostname_{std::move(hostname)}
+  {}
+
+  host_t::
+  host_t(std::string hostname, std::optional<std::string> port)
+    : hostname_{std::move(hostname)}, port_{std::move(port)}
+  {}
+
+  std::string const&
+  host_t::
+  hostname() const
+  {
+    return hostname_;
+  }
+
+  std::optional<std::string> const&
+  host_t::
+  port() const
+  {
+    return port_;
+  }
+
+  std::optional<host_t>
+  host_t::
+  try_parse(std::vector<std::string> const& strings, std::error_code&)
+  {
+    std::string host_part;
+    std::optional<std::string> opt_port_part;
+
+    if (auto it = strings.rbegin(); it != strings.rend()) {
+      auto first = it->begin();
+      auto last = it->end();
+
+      auto try_parse_host = [&](auto init)
+      {
+        auto c = init;
+
+        while (c != last && uri::grammar::is_host(*c)) {
+          host_part += *c++;
+        }
+
+        return c;
+      };
+
+      auto try_parse_port = [&](auto init)
+      {
+        auto c = init;
+
+        if (c != last && *c == ':') {
+          ++c; // skips ':'
+
+          opt_port_part = std::string{};
+
+          while (c != last && uri::grammar::is_digit(*c)) {
+            *opt_port_part += *c++;
+          }
+
+          return c;
+        }
+
+        return init;
+      };
+
+      first = try_parse_host(first);
+      first = try_parse_port(first);
+
+      if (first != last) {
+        return std::nullopt;
+      }
+    }
+
+    return {{host_part, opt_port_part}};
+  }
+
+  std::string
+  to_string(host_t const& host)
+  {
+    std::string str{host.hostname()};
+
+    if (host.port())
+      str += ':' + *host.port();
+
+    return str;
+  }
+
+} // namespace code::seafire::protocol::rfc7230

code/seafire/protocol/rfc7230/host.hxx

@@ -0,0 +1,43 @@
+#ifndef code__seafire__protocol__rfc7230__host_hxx_
+#define code__seafire__protocol__rfc7230__host_hxx_
+
+#include <optional>
+#include <string>
+#include <system_error>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7230
+{
+
+  class host_t
+  {
+  public:
+    static constexpr char const name[] = "host";
+
+    explicit
+    host_t(std::string);
+
+    host_t(std::string, std::optional<std::string>);
+
+    std::string const&
+    hostname() const;
+
+    std::optional<std::string> const&
+    port() const;
+
+    static
+    std::optional<host_t>
+    try_parse(std::vector<std::string> const&, std::error_code&);
+
+  private:
+    std::string hostname_;
+    std::optional<std::string> port_;
+
+  };
+
+  std::string
+  to_string(host_t const&);
+
+} // namespace code::seafire::protocol::rfc7230
+
+#endif

code/seafire/protocol/rfc7231/accept.cxx

@@ -0,0 +1,16 @@
+#include <code/seafire/protocol/rfc7231/accept.hxx>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  std::optional<media_range_t>
+  accept_t::
+  try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+  {
+    if (strings.empty())
+      return std::nullopt;
+
+    return media_range_t::try_parse(strings, ec);
+  }
+
+} // namespace code::seafire::protocol::rfc7231

code/seafire/protocol/rfc7231/accept.hxx

@@ -0,0 +1,27 @@
+#ifndef code__seafire__protocol__rc7231__accept_hxx_
+#define code__seafire__protocol__rc7231__accept_hxx_
+
+#include <code/seafire/protocol/rfc7231/media-range.hxx>
+
+#include <optional>
+#include <string>
+#include <system_error>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  struct accept_t
+  {
+    using alias_type = media_range_t;
+
+    static constexpr char const name[] = "accept";
+
+    static
+    std::optional<media_range_t>
+    try_parse(std::vector< std::string > const& strings, std::error_code& ec);
+
+  };
+
+} // namespace code::seafire::protocol::rfc7231
+
+#endif

code/seafire/protocol/rfc7231/allow.hxx

@@ -0,0 +1,36 @@
+#ifndef code__seafire__protocol__rc7231__allow_hxx_
+#define code__seafire__protocol__rc7231__allow_hxx_
+
+#include <code/seafire/protocol/token.hxx>
+
+#include <sstream>
+#include <string>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  struct allow_t {
+    using alias_type = tokens_t;
+
+    static constexpr char const name[] = "allow";
+
+    static
+    std::string
+    to_string(tokens_t const& tokens)
+    {
+      std::ostringstream str;
+
+      if (auto it = tokens.begin(); it != tokens.end()) {
+        str << *it;
+
+        while (++it != tokens.end())
+          str << ", " << *it;
+      }
+
+      return str.str();
+    }
+  };
+
+} // namespace code::seafire::protocol::rfc7231
+
+#endif

code/seafire/protocol/rfc7231/content-type.cxx

@@ -0,0 +1,17 @@
+#include <code/seafire/protocol/rfc7231/content-type.hxx>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  std::optional<media_type_t>
+  content_type_t::
+  try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+  {
+    if (auto it = strings.rbegin(); it != strings.rend()) {
+      return media_type_t::try_parse(*it, ec);
+    }
+
+    return {};
+  }
+
+} // namespace code::seafire::protocol::rfc7231

code/seafire/protocol/rfc7231/content-type.hxx

@@ -0,0 +1,28 @@
+#ifndef code__seafire__protocol__rfc7231__content_type_hxx_
+#define code__seafire__protocol__rfc7231__content_type_hxx_
+
+#include <code/seafire/protocol/media-type.hxx>
+
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  // fixme: make class
+  struct content_type_t
+  {
+    using alias_type = media_type_t;
+
+    static constexpr char const name[] = "content-type";
+
+    static
+    std::optional<media_type_t>
+    try_parse(std::vector<std::string> const&, std::error_code&);
+
+  };
+
+} // namespace code::seafire::protocol::rfc7231
+
+#endif

code/seafire/protocol/rfc7231/date.hxx

@@ -0,0 +1,43 @@
+#ifndef code__seafire__protocol__rfc7231__date_hxx_
+#define code__seafire__protocol__rfc7231__date_hxx_
+
+#include <code/seafire/protocol/date-time.hxx>
+
+#include <chrono>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  /// fixme: make class
+  struct date_t
+  {
+    using alias_type = std::chrono::system_clock::time_point;
+
+    static constexpr char const name[] = "date";
+
+    static
+    std::optional<std::chrono::system_clock::time_point>
+    try_parse(std::vector<std::string> const& strings, std::error_code&)
+    {
+      if (strings.empty()) {
+        return std::nullopt;
+      }
+
+      return try_parse_http_date(strings.front());
+    }
+
+    static
+    std::string
+    to_string(std::chrono::system_clock::time_point const& time)
+    {
+      return format_http_date(time);
+    }
+
+  };
+
+} // namespace code::seafire::protocol::rfc7231
+
+#endif

code/seafire/protocol/rfc7231/location.hxx

@@ -0,0 +1,28 @@
+#ifndef code__seafire__protocol__rc7231__location_hxx_
+#define code__seafire__protocol__rc7231__location_hxx_
+
+#include <code/uri/uri.hxx>
+
+#include <string>
+#include <system_error>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  struct location_t
+  {
+    using alias_type = uri::uri_t;
+  
+    static constexpr const char name[] = "location";
+  
+    static
+    std::string
+    to_string(uri::uri_t const& location)
+    {
+      return uri::to_string(location);
+    }
+  };
+
+} // namespace code::seafire::protocol::rfc7231
+
+#endif

code/seafire/protocol/rfc7231/media-range.cxx

@@ -0,0 +1,112 @@
+#include <code/seafire/protocol/rfc7231/media-range.hxx>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  media_range_t::
+  media_range_t()
+  {}
+
+  media_range_t::
+  media_range_t(media_type_t type)
+    : types_{std::move(type)}
+  {}
+
+  media_range_t::
+  media_range_t(std::vector<media_type_t> types)
+    : types_{std::move(types)}
+  {
+    sort_internals();
+  }
+
+  media_range_t::const_iterator
+  media_range_t::
+  begin() const
+  {
+    return get().begin();
+  }
+
+  media_range_t::const_iterator
+  media_range_t::
+  cbegin() const
+  {
+    return get().cbegin();
+  }
+
+  media_range_t::const_iterator
+  media_range_t::
+  end() const
+  {
+    return get().end();
+  }
+
+  media_range_t::const_iterator
+  media_range_t::
+  cend() const
+  {
+    return get().cend();
+  }
+
+  std::vector<media_type_t> const&
+  media_range_t::
+  get() const
+  {
+    return types_;
+  }
+
+  std::optional<media_range_t>
+  media_range_t::
+  try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+  {
+    if (auto it = strings.rbegin(); it != strings.rend()) {
+      auto begin = it->begin();
+      return try_parse(begin, it->end(), ec);
+    }
+
+    return std::nullopt;
+  }
+
+  void
+  media_range_t::
+  sort_internals()
+  {
+    struct {
+      int
+      specificity(media_type_t const& type)
+      {
+        if (type.type() == "*")
+          return 0;
+
+        if (type.subtype() == "*")
+          return 1;
+
+        if (type.params().size() < 1)
+          return 2;
+
+        return 3;
+      }
+
+      bool
+      operator()(media_type_t const& a, media_type_t const& b)
+      {
+        auto const sa = specificity(a);
+        auto const sb = specificity(b);
+
+        if (sa == sb) {
+          if (a.type() < b.type())
+            return true;
+
+          if (a.subtype() < b.subtype())
+            return true;
+
+          return false;
+        }
+
+        return sb < sa;
+      }
+    } precedence;
+
+    std::sort(types_.begin(), types_.end(), precedence);
+  }
+
+} // namespace code::seafire::protocol::rfc7231

code/seafire/protocol/rfc7231/media-range.hxx

@@ -0,0 +1,60 @@
+#ifndef code_seafire__protocol__rc7231__media_range_hxx_
+#define code_seafire__protocol__rc7231__media_range_hxx_
+
+#include <code/seafire/protocol/media-type.hxx>
+
+#include <algorithm>
+#include <system_error>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  class media_range_t {
+  public:
+    using const_iterator = typename std::vector<media_type_t>::const_iterator;
+
+    media_range_t();
+
+    media_range_t(media_type_t type);
+
+    media_range_t(std::vector<media_type_t> types);
+
+    const_iterator
+    begin() const;
+
+    const_iterator
+    cbegin() const;
+
+    const_iterator
+    end() const;
+
+    const_iterator
+    cend() const;
+
+    std::vector<media_type_t> const&
+    get() const;
+
+    template<typename InputIterator>
+    static
+    std::optional<media_range_t>
+    try_parse(InputIterator& begin,
+              InputIterator const& end,
+              std::error_code& ec);
+
+    static
+    std::optional<media_range_t>
+    try_parse(std::vector<std::string> const& strings, std::error_code& ec);
+
+  private:
+    void
+    sort_internals();
+
+    std::vector<media_type_t> types_;
+  };
+
+} // namespace code::seafire::protocol::rfc7231
+
+#include <code/seafire/protocol/rfc7231/media-range.txx>
+
+#endif

code/seafire/protocol/rfc7231/media-range.txx

@@ -0,0 +1,37 @@
+namespace code::seafire::protocol::rfc7231
+{
+
+  template<typename InputIterator>
+  std::optional<media_range_t>
+  media_range_t::
+  try_parse(InputIterator& begin,
+            InputIterator const& end,
+            std::error_code& ec)
+  {
+    auto skip_whitespace = [&] {
+      while (begin != end && grammar::is_space(*begin))
+        ++begin;
+    };
+
+    std::vector<media_type_t> types;
+
+    while (begin != end) {
+      skip_whitespace();
+
+      auto type = media_type_t::try_parse(begin, end, ec);
+
+      if (ec || !type)
+        return std::nullopt;
+
+      types.emplace_back(std::move(*type));
+
+      skip_whitespace();
+
+      if (begin != end && *begin == ',')
+        ++begin;
+    }
+
+    return types;
+  }
+
+} // namespace code::seafire::protocol::rfc7231

code/seafire/protocol/rfc7231/product.cxx

@@ -0,0 +1,96 @@
+#include <code/seafire/protocol/rfc7231/product.hxx>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  product_t::
+  product_t(token_t name)
+    : name_{std::move(name)}
+  {}
+
+  product_t::
+  product_t(token_t name, token_t version)
+    : name_{std::move(name)},
+      version_{std::move(version)}
+  {}
+
+  token_t const&
+  product_t::
+  name() const
+  {
+    return name_;
+  }
+
+  std::optional<token_t> const&
+  product_t::
+  version() const
+  {
+    return version_;
+  }
+
+  void
+  to_stream(std::ostream& o, product_t const& p)
+  {
+    if (p.name().empty())
+      return;
+
+    o << p.name();
+
+    if (p.version() && !p.version()->empty())
+      o << "/" << *p.version();
+  }
+
+  std::string
+  to_string(product_t const& p)
+  {
+    std::ostringstream str_stream;
+    to_stream(str_stream, p);
+    return str_stream.str();
+  }
+
+  void
+  to_stream(std::ostream& o, products_t const& products)
+  {
+    for (auto const& j : products) {
+      to_stream(o, j);
+      o << " ";
+    }
+  }
+
+  std::string
+  to_string(products_t const& products)
+  {
+    std::ostringstream str_stream;
+    to_stream(str_stream, products);
+    return str_stream.str();
+  }
+
+  std::optional<product_t>
+  try_parse_product(std::string const& str)
+  {
+    auto begin = str.begin();
+    return try_parse_product(begin, str.end());
+  }
+
+  std::optional<product_t>
+  try_parse_product(std::string const& str, std::error_code& ec)
+  {
+    auto begin = str.begin();
+    return try_parse_product(begin, str.end(), ec);
+  }
+
+  std::optional<products_t>
+  try_parse_products(std::string const& str)
+  {
+    auto begin = str.begin();
+    return try_parse_products(begin, str.end());
+  }
+
+  std::optional<products_t>
+  try_parse_products(std::string const& str, std::error_code& ec)
+  {
+    auto begin = str.begin();
+    return try_parse_products(begin, str.end(), ec);
+  }
+
+} // namespace code::seafire::protocol::rfc7231

code/seafire/protocol/rfc7231/product.hxx

@@ -0,0 +1,77 @@
+#ifndef code__seafire__protocol__rfc7231__product_hxx_
+#define code__seafire__protocol__rfc7231__product_hxx_
+
+#include <code/seafire/protocol/grammar.hxx>
+#include <code/seafire/protocol/token.hxx>
+
+#include <optional>
+#include <ostream>
+#include <sstream>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  class product_t {
+  public:
+    product_t(token_t);
+
+    product_t(token_t, token_t);
+
+    token_t const&
+    name() const;
+
+    std::optional<token_t> const&
+    version() const;
+
+  private:
+    token_t name_;
+    std::optional<token_t> version_;
+
+  };
+
+  using products_t = std::vector<product_t>;
+
+  void
+  to_stream(std::ostream&, product_t const&);
+
+  std::string
+  to_string(product_t const&);
+
+  void
+  to_stream(std::ostream&, products_t const&);
+
+  std::string
+  to_string(products_t const&);
+
+  template<typename InputIterator>
+  std::optional<product_t>
+  try_parse_product(InputIterator&, InputIterator);
+
+  template<typename InputIterator>
+  std::optional<product_t>
+  try_parse_product(InputIterator&, InputIterator, std::error_code& ec);
+
+  std::optional<product_t>
+  try_parse_product(std::string const&);
+
+  template<typename InputIterator>
+  std::optional<products_t>
+  try_parse_products(InputIterator&, InputIterator);
+  template<typename InputIterator>
+
+  std::optional<products_t>
+  try_parse_products(InputIterator&, InputIterator, std::error_code&);
+
+  std::optional<products_t>
+  try_parse_products(std::string const&);
+
+  std::optional<products_t>
+  try_parse_products(std::string const&, std::error_code&);
+
+} // namespace code::seafire::protocol::rfc7231
+
+#include <code/seafire/protocol/rfc7231/product.txx>
+
+#endif

code/seafire/protocol/rfc7231/product.txx

@@ -0,0 +1,115 @@
+namespace code::seafire::protocol::rfc7231
+{
+
+  template<typename InputIterator>
+  std::optional<product_t>
+  try_parse_product(InputIterator& first, InputIterator last)
+  {
+    auto name = try_parse_token(first, last);
+
+    if (!name) {
+      return std::nullopt;
+    }
+
+    if (first != last && *first == '/') {
+      ++first; // skips '/'
+      auto version = try_parse_token(first, last);
+
+      if (!version) {
+        return std::nullopt;
+      }
+
+      return {{*name, *version}};
+    }
+
+    return {{*name}};
+  }
+
+  template<typename InputIterator>
+  std::optional<product_t>
+  try_parse_product(InputIterator& first, InputIterator last, std::error_code& ec)
+  {
+    ec = {};
+
+    auto name = try_parse_token(first, last, ec);
+
+    if (ec) {
+      return std::nullopt;
+    }
+
+    if (!name) {
+      return std::nullopt;
+    }
+
+    if (first != last && *first == '/') {
+      ++first; // skips '/'
+      auto version = try_parse_token(first, last, ec);
+
+      if (ec) {
+        return std::nullopt;
+      }
+
+      if (!version) {
+        return std::nullopt;
+      }
+
+      return {{*name, *version}};
+    }
+
+    return {{*name}};
+  }
+
+
+  template<typename InputIterator>
+  std::optional<products_t>
+  try_parse_products(InputIterator& first, InputIterator last)
+  {
+    products_t products;
+
+    while (first != last) {
+      auto p = try_parse_product(first, last);
+
+      if (!p) {
+        return std::nullopt;
+      }
+
+      products.emplace_back(std::move(*p));
+
+      while (first != last && grammar::is_space(*first)) {
+        ++first; // skips whitespace
+      }
+    }
+
+    return products;
+  }
+
+  template<typename InputIterator>
+  std::optional<products_t>
+  try_parse_products(InputIterator& first, InputIterator last, std::error_code& ec)
+  {
+    ec = {};
+
+    products_t products;
+
+    while (first != last) {
+      auto p = try_parse_product(first, last, ec);
+
+      if (ec) {
+        return std::nullopt;
+      }
+
+      if (!p) {
+        return std::nullopt;
+      }
+
+      products.emplace_back(std::move(*p));
+
+      while (first != last && grammar::is_space(*first)) {
+        ++first; // skips whitespace
+      }
+    }
+
+    return products;
+  }
+
+} // namespace code::seafire::protocol::rfc7231

code/seafire/protocol/rfc7231/server.hxx

@@ -0,0 +1,42 @@
+#ifndef code__seafire__protocol__rfc7231__server_hxx_
+#define code__seafire__protocol__rfc7231__server_hxx_
+
+#include <code/seafire/protocol/rfc7231/product.hxx>
+
+#include <optional>
+#include <string>
+
+namespace code::seafire::protocol::rfc7231
+{
+
+  struct server_t
+  {
+    using alias_type = products_t;
+
+    static constexpr const char* name = "server";
+
+    static
+    std::optional<products_t>
+    try_parse(std::vector<std::string> const& strings)
+    {
+      if (auto it = strings.rbegin(); it != strings.rend())
+        return try_parse_products(*it);
+
+      return {};
+    }
+
+    static
+    std::optional<products_t>
+    try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+    {
+      if (auto it = strings.rbegin(); it != strings.rend())
+        return try_parse_products(*it, ec);
+
+      return {};
+    }
+
+  };
+
+} // namespace code::seafire::protocol::rfc7231
+
+#endif

code/seafire/protocol/rfc7232/entity-tag.cxx

@@ -0,0 +1,76 @@
+#include <code/seafire/protocol/rfc7232/entity-tag.hxx>
+
+namespace code::seafire::protocol::rfc7232
+{
+
+  entity_tag_t::
+  entity_tag_t(std::string tag, tag_type type)
+    : tag_{ std::move(tag) }, type_{ type }
+  {
+    if (auto p = this->tag().find('"'); p != std::string::npos)
+      throw std::invalid_argument{ "ETag may not contain \"" };
+  }
+
+  std::string const&
+  entity_tag_t::
+  tag() const
+  {
+    return tag_;
+  }
+
+  entity_tag_t::tag_type
+  entity_tag_t::
+  type() const
+  {
+    return type_;
+  }
+
+  std::string
+  to_string(entity_tag_t const& et)
+  {
+    if (is_strong(et))
+      return "\"" + et.tag() + "\"";
+
+    return "W/\"" + et.tag() + '"';
+  }
+
+  bool
+  is_strong(entity_tag_t const& et)
+  {
+    return et.type() == entity_tag_t::strong;
+  }
+
+  bool
+  is_weak(entity_tag_t const& et)
+  {
+    return et.type() == entity_tag_t::weak;
+  }
+
+  bool
+  operator==(entity_tag_t const& lhs, entity_tag_t const& rhs)
+  {
+    return strong_compare(lhs, rhs);
+  }
+
+  bool
+  operator!=(entity_tag_t const& lhs, entity_tag_t const& rhs)
+  {
+    return !(lhs == rhs);
+  }
+
+  bool
+  strong_compare(entity_tag_t const& lhs, entity_tag_t const& rhs)
+  {
+    if (is_weak(lhs) || is_weak(rhs))
+      return false;
+
+    return lhs.tag() == rhs.tag();
+  }
+
+  bool
+  weak_compare(entity_tag_t const& lhs, entity_tag_t const& rhs)
+  {
+    return lhs.tag() == rhs.tag();
+  }
+
+} // namespace code::seafire::protocol::rfc7232

code/seafire/protocol/rfc7232/entity-tag.hxx

@@ -0,0 +1,72 @@
+#ifndef code__seafire__protocol__entity_tag_hxx_
+#define code__seafire__protocol__entity_tag_hxx_
+
+#include <optional>
+#include <stdexcept>
+#include <string>
+#include <system_error>
+
+namespace code::seafire::protocol::rfc7232
+{
+
+  class entity_tag_t
+  {
+  public:
+    enum class tag_type { strong, weak };
+
+    static constexpr tag_type strong = tag_type::strong;
+    static constexpr tag_type weak = tag_type::weak;
+
+    entity_tag_t(std::string tag, tag_type type);
+
+    std::string const&
+    tag() const;
+
+    tag_type
+    type() const;
+
+    template<typename InputIterator>
+    static
+    std::optional<entity_tag_t>
+    try_parse(InputIterator& it,
+              InputIterator const& end,
+              std::error_code& ec);
+
+    template<typename InputIterator>
+    static
+    std::optional<entity_tag_t>
+    try_parse(InputIterator&& it,
+              InputIterator const& end,
+              std::error_code& ec);
+
+  private:
+    std::string tag_;
+    tag_type type_;
+  };
+
+  std::string
+  to_string(entity_tag_t const& et);
+
+  bool
+  is_strong(entity_tag_t const& et);
+
+  bool
+  is_weak(entity_tag_t const& et);
+
+  bool
+  operator==(entity_tag_t const& lhs, entity_tag_t const& rhs);
+
+  bool
+  operator!=(entity_tag_t const& lhs, entity_tag_t const& rhs);
+
+  bool
+  strong_compare(entity_tag_t const& lhs, entity_tag_t const& rhs);
+
+  bool
+  weak_compare(entity_tag_t const& lhs, entity_tag_t const& rhs);
+
+  } // namespace code::seafire::protocol::rfc7232
+
+#include <code/seafire/protocol/rfc7232/entity-tag.txx>
+
+#endif

code/seafire/protocol/rfc7232/entity-tag.txx

@@ -0,0 +1,55 @@
+namespace code::seafire::protocol::rfc7232
+{
+
+  template<typename InputIterator>
+  std::optional<entity_tag_t>
+  entity_tag_t::
+  try_parse(InputIterator& it,
+            InputIterator const& end,
+            std::error_code& ec)
+  {
+    bool weak = false;
+
+    if (it == end)
+      return {};
+
+    if (*it == 'W') {
+      ++it; // consume 'W'
+
+      if (it == end || *it != '/')
+        return {};
+
+      ++it; // consume '/'
+
+      weak = true;
+    }
+
+    if (it == end || *it != '"')
+      return {};
+
+    ++it; // consume '"'
+
+    std::string opaque;
+
+    while (it != end && *it != '"') // TODO: Validate *it
+      opaque += *it++;
+
+    if (it == end || *it != '"')
+      return {};
+
+    ++it; // consume '"'
+
+    return entity_tag_t{opaque, weak ? entity_tag_t::weak : entity_tag_t::strong};
+  }
+
+  template<typename InputIterator>
+  std::optional<entity_tag_t>
+  entity_tag_t::
+  try_parse(InputIterator&& it,
+            InputIterator const& end,
+            std::error_code& ec)
+  {
+    return try_parse(it, end, ec);
+  }
+
+} // namespace code::seafire::protocol::rfc7232

code/seafire/protocol/rfc7232/etag.hxx

@@ -0,0 +1,18 @@
+#ifndef code__seafire__protocol__rfc7232__etag_hxx_
+#define code__seafire__protocol__rfc7232__etag_hxx_
+
+#include <code/seafire/protocol/rfc7232/entity-tag.hxx>
+
+namespace code::seafire::protocol::rfc7232
+{
+
+  struct etag_t {
+    using alias_type = entity_tag_t;
+
+    static constexpr char const name[] = "etag";
+
+  };
+
+} // namespace code::seafire::protocol::rcf7232
+
+#endif

code/seafire/protocol/rfc7232/if-match.hxx

@@ -0,0 +1,55 @@
+#ifndef libseafire__protocol__rfc7232__if_match_hxx_
+#define libseafire__protocol__rfc7232__if_match_hxx_
+
+#include <code/seafire/protocol/error.hxx>
+#include <code/seafire/protocol/grammar.hxx>
+#include <code/seafire/protocol/rfc7232/entity-tag.hxx>
+
+#include <optional>
+#include <sstream>
+#include <string>
+#include <system_error>
+#include <variant>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7232
+{
+
+  class if_match_t
+  {
+  public:
+    static constexpr char const name[] = "if-match";
+
+    struct anything_t {};
+
+    static constexpr anything_t anything{};
+
+    if_match_t(anything_t);
+
+    if_match_t(std::vector<entity_tag_t>);
+
+    bool
+    is_anything() const;
+
+    std::vector<entity_tag_t> const&
+    tags() const;
+
+    static
+    std::optional<if_match_t>
+    try_parse(std::vector<std::string> const&,
+              std::error_code&);
+
+  private:
+    std::variant<
+      anything_t, std::vector<entity_tag_t>
+    > value_;
+  };
+
+  std::string
+  to_string(if_match_t const&);
+
+} // namespace code::seafire::protocol::rfc7232
+
+#include <code/seafire/protocol/rfc7232/if-match.ixx>
+
+#endif

code/seafire/protocol/rfc7232/if-match.ixx

@@ -0,0 +1,115 @@
+namespace code::seafire::protocol::rfc7232
+{
+
+  inline
+  if_match_t::
+  if_match_t(anything_t)
+    : value_{anything}
+  {}
+
+  inline
+  if_match_t::
+  if_match_t(std::vector<entity_tag_t> tags)
+    : value_{std::move(tags)}
+  {}
+
+  inline
+  bool
+  if_match_t::
+  is_anything() const
+  {
+    return std::holds_alternative<anything_t>(value_);
+  }
+
+  inline
+  std::vector<entity_tag_t> const&
+  if_match_t::
+  tags() const
+  {
+    if (std::holds_alternative<std::vector<entity_tag_t>>(value_))
+      return std::get<std::vector<entity_tag_t>>(value_);
+
+    throw std::invalid_argument{"invalid if-match"};
+  }
+
+  inline
+  std::optional<if_match_t>
+  if_match_t::
+  try_parse(std::vector<std::string> const& strings,
+            std::error_code& ec)
+  {
+    std::vector<entity_tag_t> tags;
+
+    for (auto const& j : strings) {
+      auto it = j.begin();
+
+      while (it != j.end()) {
+        grammar::skip_space(it, j.end());
+
+        if (it != j.end() && *it == '*') {
+          ++it; // consume '*'
+
+          grammar::skip_space(it, j.end());
+
+          if (it != j.end() || tags.size() > 0) {
+            ec = make_error_code(protocol_error_t::invalid_header_value);
+            return std::nullopt;
+          }
+
+          return anything;
+        }
+
+        auto tag = entity_tag_t::try_parse(it, j.end(), ec);
+
+        if (ec)
+          return std::nullopt;
+
+        if (!tag) {
+          ec = make_error_code(protocol_error_t::invalid_header_value);
+          return std::nullopt;
+        }
+
+        tags.emplace_back(std::move(*tag));
+
+        grammar::skip_space(it, j.end());
+
+        if (it != j.end()) {
+          if (*it != ',') {
+            ec = make_error_code(protocol_error_t::invalid_header_value);
+            return std::nullopt;
+          }
+
+          ++it;
+        }
+      }
+    }
+
+    if (tags.empty())
+      return {};
+
+    return tags;
+  }
+
+  inline
+  std::string
+  to_string(if_match_t const& if_match)
+  {
+    if (if_match.is_anything())
+      return "*";
+
+    std::ostringstream str;
+
+    auto it = if_match.tags().begin();
+
+    if (it != if_match.tags().end())
+      str << to_string(*it++);
+
+    while (it != if_match.tags().end()) {
+      str << ", ";
+      str << to_string(*it++);
+    }
+
+    return str.str();
+  }
+
+} // namespace code::seafire::protocol::rfc7232

code/seafire/protocol/rfc7232/if-modified-since.hxx

@@ -0,0 +1,38 @@
+#ifndef code__seafire__protocol__rfc7232__if_modified_since_hxx_
+#define code__seafire__protocol__rfc7232__if_modified_since_hxx_
+
+#include <code/seafire/protocol/date-time.hxx>
+
+#include <chrono>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7232 {
+
+  struct if_modified_since_t
+  {
+    using alias_type = std::chrono::system_clock::time_point;
+
+    static constexpr const char name[] = "if-modified-since";
+
+    static std::string
+    to_string(std::chrono::system_clock::time_point const& point_in_time)
+    {
+      return format_http_date(point_in_time);
+    }
+
+    static
+    std::optional<std::chrono::system_clock::time_point>
+    try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+    {
+      if (strings.empty())
+        return {};
+
+      return try_parse_http_date(strings.front());
+    }
+  };
+
+} // namespace code::seafire::protocol::rfc7232
+
+#endif

code/seafire/protocol/rfc7232/if-none-match.hxx

@@ -0,0 +1,34 @@
+#ifndef code__seafire__protocol__rfc7232__if_none_match_hxx_
+#define code__seafire__protocol__rfc7232__if_none_match_hxx_
+
+#include <code/seafire/protocol/rfc7232/entity-tag.hxx>
+
+#include <optional>
+#include <system_error>
+
+namespace code::seafire::protocol::rfc7232
+{
+
+  struct if_none_match_t
+  {
+    static constexpr char const name[] = "if-none-match";
+
+    static std::optional<if_none_match_t>
+    try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+    {
+      // FIXME implement.
+      return {};
+    }
+  };
+
+  inline
+  std::string
+  to_string(if_none_match_t const& if_none_match)
+  {
+    // FIXME implement.
+    return {};
+  }
+
+} // namespace code::seafire::protocol::rfc7232
+
+#endif

code/seafire/protocol/rfc7232/if-unmodified-since.hxx

@@ -0,0 +1,38 @@
+#ifndef code__seafire__protocol__rfc7232__if_unmodified_since_hxx_
+#define code__seafire__protocol__rfc7232__if_unmodified_since_hxx_
+
+#include <code/seafire/protocol/rfc7232/entity-tag.hxx>
+
+#include <optional>
+#include <string>
+#include <system_error>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7232
+{
+
+  struct if_unmodified_since_t
+  {
+    using alias_type = std::chrono::system_clock::time_point;
+
+    static constexpr const char name[] = "if-unmodified-since";
+
+    static std::string
+    to_string(std::chrono::system_clock::time_point const& point_in_time)
+    {
+      return format_http_date(point_in_time);
+    }
+
+    static std::optional<std::chrono::system_clock::time_point>
+    try_parse(std::vector<std::string> const& strings, std::error_code& ec)
+    {
+      if (strings.empty())
+        return {};
+
+      return try_parse_http_date(strings.front());
+    }
+  };
+
+} // namespace code::seafire::protocol::rfc7232
+
+#endif

code/seafire/protocol/rfc7232/last-modified.hxx

@@ -0,0 +1,39 @@
+#ifndef code__seafire__protocol__rc7232__last_modified_hxx_
+#define code__seafire__protocol__rc7232__last_modified_hxx_
+
+#include <code/seafire/protocol/date-time.hxx>
+
+#include <chrono>
+#include <optional>
+#include <string>
+#include <system_error>
+#include <vector>
+
+namespace code::seafire::protocol::rfc7232
+{
+
+  struct last_modified_t
+  {
+    using alias_type = std::chrono::system_clock::time_point;
+
+    static constexpr const char name[] = "last-modified";
+
+    static std::string
+    to_string(std::chrono::system_clock::time_point const& point_in_time)
+    {
+      return format_http_date(point_in_time);
+    }
+
+    static std::optional<std::chrono::system_clock::time_point>
+    try_parse(std::vector<std::string> const& strings)
+    {
+      if (strings.empty())
+        return std::nullopt;
+
+      return try_parse_http_date(strings.front());
+    }
+  };
+
+} // namespace code::seafire::protocol::rfc7232
+
+#endif

code/seafire/protocol/status-code.cxx

@@ -0,0 +1,157 @@
+#include <code/seafire/protocol/status-code.hxx>
+
+#include <stdexcept>
+
+namespace code::seafire::protocol
+{
+
+  status_code_t::
+  status_code_t() = default;
+
+  /// Construct a new status code.
+  ///
+  /// Valid codes are 100 to 999 (inclusive).
+  ///
+  /// The reason string will be set if the status code is standard.
+  ///
+  /// \throws std::invalid_argument Thrown if \a code is invalid.
+  ///
+  status_code_t::
+  status_code_t(unsigned short code)
+    : code_{code}, reason_{get_reason(code)}
+  {
+    if (code < 100 || 999 < code) {
+      throw std::invalid_argument{"invalid status code"};
+    }
+  }
+
+  /// Construct a new status code with a custom reason.
+  ///
+  /// Valid codes are 100 to 999 (inclusive).
+  ///
+  /// \throws std::invalid_argument Thrown if \a code is invalid.
+  ///
+  status_code_t::
+  status_code_t(unsigned short code, std::string reason)
+    : code_{ code }, reason_{ std::move(reason) }
+  {
+    if (code < 100 || 999 < code) {
+      throw std::invalid_argument{"invalid status code"};
+    }
+  }
+
+  /// Access the code of this status code.
+  ///
+  unsigned short
+  status_code_t::
+  code() const
+  {
+    return code_;
+  }
+
+  /// Access the reason string of this status code.
+  ///
+  std::string const&
+  status_code_t::
+  reason() const
+  {
+    return reason_;
+  }
+
+  /// Convert this status code to an unsigned short value.
+  ///
+  status_code_t::
+  operator unsigned short()
+  {
+    return code_;
+  }
+
+  /// Compare two status codes for equality.
+  ///
+  bool
+  operator==(status_code_t const& lhs, status_code_t const& rhs)
+  {
+    return lhs.code() == rhs.code();
+  }
+
+  /// Compare two status codes for equality.
+  ///
+  bool
+  operator==(status_code_t const& lhs, unsigned short rhs)
+  {
+    return lhs.code() == rhs;
+  }
+
+  /// Compare two status codes for equality.
+  ///
+  bool
+  operator==(unsigned short lhs, status_code_t const& rhs)
+  {
+    return lhs == rhs.code();
+  }
+
+  /// Compare two status codes for inequality.
+  ///
+  bool
+  operator!=(status_code_t const& lhs, status_code_t const& rhs)
+  {
+    return !(lhs == rhs);
+  }
+
+  /// Compare two status codes for inequality.
+  ///
+  bool
+  operator!=(status_code_t const& lhs, unsigned short rhs)
+  {
+    return !(lhs == rhs);
+  }
+
+  /// Compare two status codes for inequality.
+  ///
+  bool
+  operator!=(unsigned short lhs, status_code_t const& rhs)
+  {
+    return !(lhs == rhs);
+  }
+
+  /// Check if the given status code, \a sc, is informational.
+  ///
+  bool
+  is_informational(status_code_t const& sc)
+  {
+    return (sc.code() / 100) == 1;
+  }
+
+  /// Check if the given status code, \a sc, indicates success.
+  ///
+  bool
+  is_success(status_code_t const& sc)
+  {
+    return (sc.code() / 100) == 2;
+  }
+
+  /// Check if the given status code, \a sc, is a redirection.
+  ///
+  bool
+  is_redirection(status_code_t const& sc)
+  {
+    return (sc.code() / 100) == 3;
+  }
+
+  /// Check if the given status code, \a sc, indicates a client error.
+  ///
+  bool
+  is_client_error(status_code_t const& sc)
+  {
+    return (sc.code() / 100) == 4;
+  }
+
+  /// Check if the given status code, \a sc, indicates a server error.
+  ///
+  bool
+  is_server_error(status_code_t const& sc)
+  {
+    return (sc.code() / 100) == 5;
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/status-code.hxx

@@ -0,0 +1,71 @@
+#ifndef code__seafire__protocol__status_code_hxx_
+#define code__seafire__protocol__status_code_hxx_
+
+#include <code/seafire/protocol/reason.hxx>
+
+#include <string>
+
+namespace code::seafire::protocol
+{
+
+  /// Represents an HTTP status code.
+  ///
+  class status_code_t
+  {
+  public:
+    status_code_t();
+
+    status_code_t(unsigned short code);
+
+    status_code_t(unsigned short code, std::string reason);
+
+    unsigned short
+    code() const;
+
+    std::string const&
+    reason() const;
+
+    operator unsigned short();
+
+  private:
+    unsigned short code_{0};
+    std::string reason_;
+
+  };
+
+  bool
+  operator==(status_code_t const&, status_code_t const&);
+
+  bool
+  operator==(status_code_t const&, unsigned short);
+
+  bool
+  operator==(unsigned short, status_code_t const&);
+
+  bool
+  operator!=(status_code_t const&, status_code_t const&);
+
+  bool
+  operator!=(status_code_t const&, unsigned short);
+
+  bool
+  operator!=(unsigned short, status_code_t const&);
+
+  bool
+  is_informational(status_code_t const&);
+
+  bool
+  is_success(status_code_t const&);
+
+  bool
+  is_redirection(status_code_t const&);
+
+  bool
+  is_client_error(status_code_t const&);
+
+  bool
+  is_server_error(status_code_t const&);
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/token.cxx

@@ -0,0 +1,80 @@
+#include <code/seafire/protocol/token.hxx>
+
+namespace code::seafire::protocol
+{
+
+  /// Construct a new empty token.
+  ///
+  token_t::
+  token_t() = default;
+
+  /// Construct a new token from a string.
+  ///
+  /// \param str The token string.
+  /// \throws std::invalid_argument Thrown if \a str is invalid.
+  ///
+  token_t::
+  token_t(std::string str)
+    : str_{
+      validate_token(str)
+        ? std::move(str)
+        : throw std::invalid_argument{"invalid token"}
+    }
+  {}
+
+  /// Construct a new token from a string.
+  ///
+  /// \param str The token string.
+  /// \throws std::invalid_argument Thrown if \a str is invalid.
+  ///
+  token_t::
+  token_t(char const* str)
+    : str_{
+      str
+      ? (
+        validate_token(str)
+          ? str
+          : throw std::invalid_argument{"invalid token"}
+        )
+      : throw std::invalid_argument{"invalid token"}
+    }
+  {}
+
+  bool
+  token_t::
+  empty() const
+  {
+    return str().empty();
+  }
+
+  std::string const&
+  token_t::
+  str() const
+  {
+    return str_;
+  }
+
+  bool
+  token_t::
+  validate_token(std::string const& str)
+  {
+    // we allow empty tokens for the sake of simplicity.
+    //
+    if (str.empty())
+      return true;
+
+    for (auto const& c : str) {
+      if (!grammar::is_tchar(c))
+        return false;
+    }
+
+    return true;
+  }
+
+  std::ostream&
+  operator<<(std::ostream& o, token_t const& t)
+  {
+    return o << t.str();
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/token.hxx

@@ -0,0 +1,170 @@
+#ifndef code__seafire__protocol__token_hxx_
+#define code__seafire__protocol__token_hxx_
+
+#include <code/seafire/protocol/grammar.hxx>
+
+#include <iostream>
+#include <optional>
+#include <string>
+#include <vector>
+
+namespace code::seafire::protocol
+{
+
+  class token_t
+  {
+  public:
+    token_t();
+
+    token_t(std::string);
+
+    token_t(char const*);
+
+    bool
+    empty() const;
+
+    std::string const&
+    str() const;
+
+    auto
+    operator<=>(token_t const&) const = default;
+
+    static
+    bool
+    validate_token(std::string const&);
+
+  private:
+    std::string str_;
+
+  };
+
+  std::ostream&
+  operator<<(std::ostream&, token_t const&);
+
+  /// Vector of tokens.
+  ///
+  using tokens_t = std::vector<token_t>;
+
+  /// Attempt to parse a token.
+  ///
+  template<typename Iterator>
+  std::optional<token_t>
+  try_parse_token(Iterator& begin, Iterator end)
+  {
+    std::string token;
+
+    while (begin != end && grammar::is_space(*begin)) {
+      ++begin;
+    }
+
+    while (begin != end && grammar::is_tchar(*begin)) {
+      token += *begin++;
+    }
+
+    if (token.empty()) {
+      return std::nullopt;
+    }
+
+    return token;
+  }
+
+  template<typename Iterator>
+  std::optional<token_t>
+  try_parse_token(Iterator& begin, Iterator end, std::error_code& ec)
+  {
+    ec = {};
+
+    std::string token;
+
+    while (begin != end && grammar::is_space(*begin)) {
+      ++begin;
+    }
+
+    while (begin != end && grammar::is_tchar(*begin)) {
+      token += *begin++;
+    }
+
+    if (token.empty()) {
+      return std::nullopt;
+    }
+
+    return token;
+  }
+
+  /// Attempt to parse tokens.
+  ///
+  template<typename Iterator>
+  std::optional<tokens_t>
+  try_parse_tokens(Iterator& begin, Iterator end)
+  {
+    tokens_t tokens;
+
+    while (begin != end) {
+      while (begin != end && grammar::is_space(*begin)) {
+        ++begin;
+      }
+
+      auto token = try_parse_token(begin, end);
+
+      if (!token) {
+        return std::nullopt;
+      }
+
+      tokens.emplace_back(std::move(*token));
+
+      while (begin != end && grammar::is_space(*begin)) {
+        ++begin;
+      }
+
+      if (begin == end || *begin != ',') {
+        break;
+      }
+
+      ++begin; // skips ','
+    }
+
+    return tokens;
+  }
+
+  /// Attempt to parse tokens.
+  ///
+  template<typename Iterator>
+  std::optional<tokens_t>
+  try_parse_tokens(Iterator& begin, Iterator end, std::error_code& ec)
+  {
+    tokens_t tokens;
+
+    while (begin != end) {
+      while (begin != end && grammar::is_space(*begin)) {
+        ++begin;
+      }
+
+      auto token = try_parse_token(begin, end, ec);
+
+      if (ec) {
+        return std::nullopt;
+      }
+
+      if (!token) {
+        return std::nullopt;
+      }
+
+      tokens.emplace_back(std::move(*token));
+
+      while (begin != end && grammar::is_space(*begin)) {
+        ++begin;
+      }
+
+      if (begin == end || *begin != ',') {
+        break;
+      }
+
+      ++begin; // skips ','
+    }
+
+    return tokens;
+  }
+
+} // namespace code::seafire::protocol
+
+#endif

code/seafire/protocol/traits.hxx

@@ -0,0 +1,70 @@
+#ifndef code__seafire__protocol__traits_hxx_
+#define code__seafire__protocol__traits_hxx_
+
+#include <type_traits>
+
+namespace code::seafire::protocol::traits
+{
+
+  /// Check if T has an alias type defined.
+  ///
+  template<typename, typename = std::void_t<>>
+  struct has_alias_type
+    : std::false_type
+  {};
+
+  template<typename T>
+  struct has_alias_type<
+    T,
+    std::void_t<
+      decltype(std::declval<typename T::alias_type>())
+    >
+  > : std::true_type
+  {};
+
+  /// Helper variable for has_alias_type.
+  ///
+  template<typename T>
+  inline constexpr bool has_alias_type_v = has_alias_type<T>::value;
+
+  /// Access the alias type of T, if available, otherwise T.
+  ///
+  template<typename T, bool = has_alias_type_v<T>>
+  struct alias_type
+  {
+    using type = T;
+  };
+
+  template<typename T>
+  struct alias_type<T, true>
+  {
+    using type = typename T::alias_type;
+  };
+
+  /// Helper for alias_type.
+  ///
+  template<typename T>
+  using alias_type_t = typename alias_type<T>::type;
+
+  template<typename, typename = std::void_t<>>
+  struct has_overridden_to_string
+    : std::false_type
+  {};
+
+  template<typename T>
+  struct has_overridden_to_string<
+    T,
+    std::void_t<
+      decltype(T::to_string(std::declval<alias_type_t<T>>()))
+    >
+  > : std::true_type
+  {};
+
+  template<typename T>
+  inline constexpr bool has_overridden_to_string_v{
+    has_overridden_to_string<T>::value
+  };
+
+} // seafire::protocol::traits
+
+#endif

code/seafire/protocol/version.hxx.in

@@ -0,0 +1,37 @@
+#ifndef code__seafire__protocol__version_hxx_
+#define code__seafire__protocol__version_hxx_
+
+// The numeric version format is AAAAABBBBBCCCCCDDDE where:
+//
+// AAAAA - major version number
+// BBBBB - minor version number
+// CCCCC - bugfix version number
+// DDD   - alpha / beta (DDD + 500) version number
+// E     - final (0) / snapshot (1)
+//
+// When DDDE is not 0, 1 is subtracted from AAAAABBBBBCCCCC. For example:
+//
+// Version      AAAAABBBBBCCCCCDDDE
+//
+// 0.1.0        0000000001000000000
+// 0.1.2        0000000001000020000
+// 1.2.3        0000100002000030000
+// 2.2.0-a.1    0000200001999990010
+// 3.0.0-b.2    0000299999999995020
+// 2.2.0-a.1.z  0000200001999990011
+//
+#define LIBCODE_SEAFIRE_PROTOCOL_VERSION       $libcode_seafire_protocol.version.project_number$ULL
+#define LIBCODE_SEAFIRE_PROTOCOL_VERSION_STR   "$libcode_seafire_protocol.version.project$"
+#define LIBCODE_SEAFIRE_PROTOCOL_VERSION_ID    "$libcode_seafire_protocol.version.project_id$"
+#define LIBCODE_SEAFIRE_PROTOCOL_VERSION_FULL  "$libcode_seafire_protocol.version$"
+
+#define LIBCODE_SEAFIRE_PROTOCOL_VERSION_MAJOR $libcode_seafire_protocol.version.major$
+#define LIBCODE_SEAFIRE_PROTOCOL_VERSION_MINOR $libcode_seafire_protocol.version.minor$
+#define LIBCODE_SEAFIRE_PROTOCOL_VERSION_PATCH $libcode_seafire_protocol.version.patch$
+
+#define LIBCODE_SEAFIRE_PROTOCOL_PRE_RELEASE   $libcode_seafire_protocol.version.pre_release$
+
+#define LIBCODE_SEAFIRE_PROTOCOL_SNAPSHOT_SN   $libcode_seafire_protocol.version.snapshot_sn$ULL
+#define LIBCODE_SEAFIRE_PROTOCOL_SNAPSHOT_ID   "$libcode_seafire_protocol.version.snapshot_id$"
+
+#endif

code/seafire/protocol/write.cxx

@@ -0,0 +1,174 @@
+#include <code/seafire/protocol/write.hxx>
+
+namespace code::seafire::protocol
+{
+
+  void
+  write(common::io::stream_t& s,
+        request_t const& r)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+    s.write(payload);
+  }
+
+  void
+  write(common::io::stream_t& s,
+        request_t const& r,
+        std::error_code& ec)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+    s.write(payload, ec);
+  }
+
+  void
+  write(common::io::stream_t& s,
+        request_t const& r,
+        common::io::const_buffers_t const& content)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+
+    for (auto const& j : content) {
+      payload.emplace_back(j);
+    }
+
+    s.write(payload);
+  }
+
+  void
+  write(common::io::stream_t& s,
+        request_t const& r,
+        common::io::const_buffers_t const& content,
+        std::error_code& ec)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+
+    for (auto const& j : content) {
+      payload.emplace_back(j);
+    }
+
+    s.write(payload, ec);
+  }
+
+  void
+  async_write(common::io::stream_t& s,
+              request_t const& r,
+              std::function<void(std::error_code)> handler)
+  {
+    auto bound = [handler](std::error_code const& ec, std::size_t)
+    {
+      handler(ec);
+    };
+
+    s.async_write(to_buffers(r), bound);
+  }
+
+  void
+  async_write(common::io::stream_t& s,
+              request_t const& r,
+              common::io::const_buffers_t const& content,
+              std::function<void(std::error_code)> handler)
+  {
+    auto bound = [handler](std::error_code const& ec, std::size_t)
+    {
+      handler(ec);
+    };
+
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+
+    for (auto const& j : content) {
+      payload.emplace_back(j);
+    }
+
+    s.async_write(payload, bound);
+  }
+
+  void
+  write(common::io::stream_t& s,
+        response_t const& r)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+    s.write(payload);
+  }
+
+  void
+  write(common::io::stream_t& s,
+        response_t const& r,
+        std::error_code& ec)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+    s.write(payload, ec);
+  }
+
+  void
+  write(common::io::stream_t& s,
+        response_t const& r,
+        common::io::const_buffers_t const& content)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+
+    for (auto const& j : content) {
+      payload.emplace_back(j);
+    }
+
+    s.write(payload);
+  }
+
+  void
+  write(common::io::stream_t& s,
+        response_t const& r,
+        common::io::const_buffers_t const& content,
+        std::error_code& ec)
+  {
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+
+    for (auto const& j : content) {
+      payload.emplace_back(j);
+    }
+
+    s.write(payload, ec);
+  }
+
+  void
+  async_write(common::io::stream_t& s,
+              response_t const& r,
+              std::function<void(std::error_code)> handler)
+  {
+    auto bound = [handler](std::error_code const& ec, std::size_t)
+    {
+      handler(ec);
+    };
+
+    s.async_write(to_buffers(r), bound);
+  }
+
+  void
+  async_write(common::io::stream_t& s,
+              response_t const& r,
+              common::io::const_buffers_t const& content,
+              std::function<void(std::error_code)> handler)
+  {
+    auto bound = [handler](std::error_code const& ec, std::size_t)
+    {
+      handler(ec);
+    };
+
+    common::io::const_buffers_t payload;
+    to_buffers(payload, r);
+
+    for (auto const& j : content) {
+      payload.emplace_back(j);
+    }
+
+    s.async_write(payload, bound);
+  }
+
+} // namespace code::seafire::protocol

code/seafire/protocol/write.hxx

@@ -0,0 +1,82 @@
+#ifndef code__seafire__protocol__write_hxx_
+#define code__seafire__protocol__write_hxx_
+
+#include <code/seafire/protocol/request.hxx>
+#include <code/seafire/protocol/response.hxx>
+
+#include <code/seafire/common/io/buffer.hxx>
+#include <code/seafire/common/io/stream.hxx>
+
+#include <asio.hpp>
+
+#include <functional>
+#include <system_error>
+
+namespace code::seafire::protocol
+{
+
+  void
+  write(common::io::stream_t&,
+        request_t const&);
+
+  void
+  write(common::io::stream_t&,
+        request_t const&,
+        std::error_code&);
+
+  void
+  write(common::io::stream_t&,
+        request_t const&,
+        std::vector<common::io::const_buffer_t> const&);
+
+  void
+  write(common::io::stream_t&,
+        request_t const&,
+        std::vector<common::io::const_buffer_t> const&,
+        std::error_code&);
+
+  void
+  async_write(common::io::stream_t&,
+              request_t const&,
+              std::function<void(std::error_code)>);
+
+  void
+  async_write(common::io::stream_t&,
+              request_t const&,
+              std::vector<common::io::const_buffer_t> const&,
+              std::function<void(std::error_code)>);
+
+  void
+  write(common::io::stream_t&,
+        response_t const&);
+
+  void
+  write(common::io::stream_t&,
+        response_t const&,
+        std::error_code&);
+
+  void
+  write(common::io::stream_t&,
+        response_t const&,
+        std::vector<common::io::const_buffer_t> const&);
+
+  void
+  write(common::io::stream_t&,
+        response_t const&,
+        std::vector<common::io::const_buffer_t> const&,
+        std::error_code&);
+
+  void
+  async_write(common::io::stream_t&,
+              response_t const&,
+              std::function<void(std::error_code)>);
+
+  void
+  async_write(common::io::stream_t&,
+              response_t const&,
+              std::vector<common::io::const_buffer_t> const&,
+              std::function<void(std::error_code)>);
+
+} // namespace code::seafire::protocol
+
+#endif

manifest

@@ -0,0 +1,14 @@
+: 1
+name: libcode-seafire-protocol
+version: 0.1.0-a.0.z
+language: c++
+summary: libcode-seafire-protocol C++ library
+license: BSD-4-Clause
+description-file: README.md
+url: https://helloryan.se/code/
+email: ryan@helloryan.se
+depends: * build2 >= 0.17.0
+depends: * bpkg >= 0.17.0
+depends: libasio ^1.29.0
+depends: libcode-uri ^0.1.0-
+depends: libcode-seafire-common ^0.1.0-

repositories.manifest

@@ -0,0 +1,15 @@
+: 1
+summary: libcode-seafire-protocol project repository
+
+:
+role: prerequisite
+location: https://pkg.cppget.org/1/beta
+trust: 70:64:FE:E4:E0:F3:60:F1:B4:51:E1:FA:12:5C:E0:B3:DB:DF:96:33:39:B9:2E:E5:C2:68:63:4C:A6:47:39:43
+
+:
+role: prerequisite
+location: https://code.helloryan.se/code/libcode-uri.git##HEAD
+
+:
+role: prerequisite
+location: https://code.helloryan.se/code/libcode-seafire-common.git##HEAD

tests/.gitignore

@@ -0,0 +1,8 @@
+# Test executables.
+#
+driver
+
+# Testscript output directories (can be symlinks).
+#
+test
+test-*

tests/build/.gitignore

@@ -0,0 +1,4 @@
+/config.build
+/root/
+/bootstrap/
+build/

tests/build/bootstrap.build

@@ -0,0 +1,5 @@
+project = # Unnamed tests subproject.
+
+using config
+using test
+using dist

tests/build/root.build

@@ -0,0 +1,16 @@
+cxx.std = latest
+
+using cxx
+
+hxx{*}: extension = hxx
+ixx{*}: extension = ixx
+txx{*}: extension = txx
+cxx{*}: extension = cxx
+
+# Every exe{} in this subproject is by default a test.
+#
+exe{*}: test = true
+
+# The test target for cross-testing (running tests under Wine, etc).
+#
+test.target = $cxx.target

tests/buildfile

@@ -0,0 +1 @@
+./: {*/ -build/}