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 //
 // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
 //
 // Distributed under the Boost Software License, Version 1.0. (See accompanying
 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 // Official repository: https://github.com/boostorg/beast
 //
 
 #ifndef BOOST_BEAST_HTTP_MESSAGE_HPP
 #define BOOST_BEAST_HTTP_MESSAGE_HPP
 
 #include <boost/beast/http/message_fwd.hpp>
 
 #include <boost/beast/core/detail/config.hpp>
 #include <boost/beast/core/string.hpp>
 #include <boost/beast/http/fields.hpp>
 #include <boost/beast/http/status.hpp>
 #include <boost/beast/http/type_traits.hpp>
 #include <boost/beast/http/verb.hpp>
 #include <boost/assert.hpp>
 #include <boost/core/empty_value.hpp>
 #include <boost/mp11/integer_sequence.hpp>
 #include <boost/optional.hpp>
 #include <boost/throw_exception.hpp>
 #include <tuple>
 #include <utility>
 
 namespace boost {
 namespace beast {
 namespace http {
 
 /** A container for an HTTP request or response header.
 
     This container is derived from the `Fields` template type.
     To understand all of the members of this class it is necessary
     to view the declaration for the `Fields` type. When using
     the default fields container, those declarations are in
     @ref fields.
 
     Newly constructed header objects have version set to
     HTTP/1.1. Newly constructed response objects also have
     result code set to @ref status::ok.
 
     A `header` includes the start-line and header-fields.
 */
 #if BOOST_BEAST_DOXYGEN
 template<bool isRequest, class Fields = fields>
 class header : public Fields
 #else
 template<class Fields>
 class header<true, Fields> : public Fields
 #endif
 {
 public:
     static_assert(is_fields<Fields>::value,
         "Fields type requirements not met");
 
     /// Indicates if the header is a request or response.
 #if BOOST_BEAST_DOXYGEN
     using is_request = std::integral_constant<bool, isRequest>;
 #else
     using is_request = std::true_type;
 #endif
 
     /// The type representing the fields.
     using fields_type = Fields;
 
     /// Constructor
     header() = default;
 
     /// Constructor
     header(header&&) = default;
 
     /// Constructor
     header(header const&) = default;
 
     /// Assignment
     header& operator=(header&&) = default;
 
     /// Assignment
     header& operator=(header const&) = default;
 
     /** Return the HTTP-version.
 
         This holds both the major and minor version numbers,
         using these formulas:
         @code
             unsigned major = version / 10;
             unsigned minor = version % 10;
         @endcode
 
         Newly constructed headers will use HTTP/1.1 by default.
     */
     unsigned version() const noexcept
     {
         return version_;
     }
 
     /** Set the HTTP-version.
 
         This holds both the major and minor version numbers,
         using these formulas:
         @code
             unsigned major = version / 10;
             unsigned minor = version % 10;
         @endcode
 
         Newly constructed headers will use HTTP/1.1 by default.
 
         @param value The version number to use
     */
     void version(unsigned value) noexcept
     {
         BOOST_ASSERT(value > 0 && value < 100);
         version_ = value;
     }
 
     /** Return the request-method verb.
 
         If the request-method is not one of the recognized verbs,
         @ref verb::unknown is returned. Callers may use @ref method_string
         to retrieve the exact text.
 
         @note This function is only available when `isRequest == true`.
 
         @see method_string
     */
     verb
     method() const;
 
     /** Set the request-method.
 
         This function will set the method for requests to a known verb.
 
         @param v The request method verb to set.
         This may not be @ref verb::unknown.
 
         @throws std::invalid_argument when `v == verb::unknown`.
 
         @note This function is only available when `isRequest == true`.
     */
     void
     method(verb v);
 
     /** Return the request-method as a string.
 
         @note This function is only available when `isRequest == true`.
 
         @see method
     */
     string_view
     method_string() const;
 
     /** Set the request-method.
 
         This function will set the request-method a known verb
         if the string matches, otherwise it will store a copy of
         the passed string.
 
         @param s A string representing the request-method.
 
         @note This function is only available when `isRequest == true`.
     */
     void
     method_string(string_view s);
 
     /** Returns the request-target string.
 
         The request target string returned is the same string which
         was received from the network or stored. In particular, it will
         contain url-encoded characters and should follow the syntax
         rules for URIs used with HTTP.
 
         @note This function is only available when `isRequest == true`.
     */
     string_view
     target() const;
 
     /** Set the request-target string.
 
         It is the caller's responsibility to ensure that the request
         target string follows the syntax rules for URIs used with
         HTTP. In particular, reserved or special characters must be
         url-encoded. The implementation does not perform syntax checking
         on the passed string.
 
         @param s A string representing the request-target.
 
         @note This function is only available when `isRequest == true`.
     */
     void
     target(string_view s);
 
     // VFALCO Don't rearrange these declarations or
     //        ifdefs, or else the documentation will break.
 
     /** Constructor
 
         @param args Arguments forwarded to the `Fields`
         base class constructor.
 
         @note This constructor participates in overload
         resolution if and only if the first parameter is
         not convertible to @ref header, @ref verb, or
         @ref status.
     */
 #if BOOST_BEAST_DOXYGEN
     template<class... Args>
     explicit
     header(Args&&... args);
 
 #else
     template<class Arg1, class... ArgN,
         class = typename std::enable_if<
             ! std::is_convertible<typename
                 std::decay<Arg1>::type, header>::value &&
             ! std::is_convertible<typename
                 std::decay<Arg1>::type, verb>::value &&
             ! std::is_convertible<typename
                 std::decay<Arg1>::type, status>::value
         >::type>
     explicit
     header(Arg1&& arg1, ArgN&&... argn);
 
 private:
     template<bool, class, class>
     friend class message;
 
     template<class T>
     friend
     void
     swap(header<true, T>& m1, header<true, T>& m2);
 
     template<class... FieldsArgs>
     header(
         verb method,
         string_view target_,
         unsigned version_value,
         FieldsArgs&&... fields_args)
         : Fields(std::forward<FieldsArgs>(fields_args)...)
         , method_(method)
     {
         version(version_value);
         target(target_);
     }
 
     unsigned version_ = 11;
     verb method_ = verb::unknown;
 };
 
 /** A container for an HTTP request or response header.
 
     A `header` includes the start-line and header-fields.
 */
 template<class Fields>
 class header<false, Fields> : public Fields
 {
 public:
     static_assert(is_fields<Fields>::value,
         "Fields type requirements not met");
 
     /// Indicates if the header is a request or response.
     using is_request = std::false_type;
 
     /// The type representing the fields.
     using fields_type = Fields;
 
     /// Constructor.
     header() = default;
 
     /// Constructor
     header(header&&) = default;
 
     /// Constructor
     header(header const&) = default;
 
     /// Assignment
     header& operator=(header&&) = default;
 
     /// Assignment
     header& operator=(header const&) = default;
 
     /** Constructor
 
         @param args Arguments forwarded to the `Fields`
         base class constructor.
 
         @note This constructor participates in overload
         resolution if and only if the first parameter is
         not convertible to @ref header, @ref verb, or
         @ref status.
     */
     template<class Arg1, class... ArgN,
         class = typename std::enable_if<
             ! std::is_convertible<typename
                 std::decay<Arg1>::type, header>::value &&
             ! std::is_convertible<typename
                 std::decay<Arg1>::type, verb>::value &&
             ! std::is_convertible<typename
                 std::decay<Arg1>::type, status>::value
         >::type>
     explicit
     header(Arg1&& arg1, ArgN&&... argn);
 
     /** Return the HTTP-version.
 
         This holds both the major and minor version numbers,
         using these formulas:
         @code
             unsigned major = version / 10;
             unsigned minor = version % 10;
         @endcode
 
         Newly constructed headers will use HTTP/1.1 by default.
     */
     unsigned version() const noexcept
     {
         return version_;
     }
 
     /** Set the HTTP-version.
 
         This holds both the major and minor version numbers,
         using these formulas:
         @code
             unsigned major = version / 10;
             unsigned minor = version % 10;
         @endcode
 
         Newly constructed headers will use HTTP/1.1 by default.
 
         @param value The version number to use
     */
     void version(unsigned value) noexcept
     {
         BOOST_ASSERT(value > 0 && value < 100);
         version_ = value;
     }
 #endif
 
     /** The response status-code result.
 
         If the actual status code is not a known code, this
         function returns @ref status::unknown. Use @ref result_int
         to return the raw status code as a number.
 
         @note This member is only available when `isRequest == false`.
     */
     status
     result() const;
 
     /** Set the response status-code.
 
         @param v The code to set.
 
         @note This member is only available when `isRequest == false`.
     */
     void
     result(status v);
 
     /** Set the response status-code as an integer.
 
         This sets the status code to the exact number passed in.
         If the number does not correspond to one of the known
         status codes, the function @ref result will return
         @ref status::unknown. Use @ref result_int to obtain the
         original raw status-code.
 
         @param v The status-code integer to set.
 
         @throws std::invalid_argument if `v > 999`.
     */
     void
     result(unsigned v);
 
     /** The response status-code expressed as an integer.
 
         This returns the raw status code as an integer, even
         when that code is not in the list of known status codes.
 
         @note This member is only available when `isRequest == false`.
     */
     unsigned
     result_int() const;
 
     /** Return the response reason-phrase.
 
         The reason-phrase is obsolete as of rfc7230.
 
         @note This function is only available when `isRequest == false`.
     */
     string_view
     reason() const;
 
     /** Set the response reason-phrase (deprecated)
 
         This function sets a custom reason-phrase to a copy of
         the string passed in. Normally it is not necessary to set
         the reason phrase on an outgoing response object; the
         implementation will automatically use the standard reason
         text for the corresponding status code.
 
         To clear a previously set custom phrase, pass an empty
         string. This will restore the default standard reason text
         based on the status code used when serializing.
 
         The reason-phrase is obsolete as of rfc7230.
 
         @param s The string to use for the reason-phrase.
 
         @note This function is only available when `isRequest == false`.
     */
     void
     reason(string_view s);
 
 private:
 #if ! BOOST_BEAST_DOXYGEN
     template<bool, class, class>
     friend class message;
 
     template<class T>
     friend
     void
     swap(header<false, T>& m1, header<false, T>& m2);
 
     template<class... FieldsArgs>
     header(
         status result,
         unsigned version_value,
         FieldsArgs&&... fields_args)
         : Fields(std::forward<FieldsArgs>(fields_args)...)
         , result_(result)
     {
         version(version_value);
     }
 
     unsigned version_ = 11;
     status result_ = status::ok;
 #endif
 };
 
 #if BOOST_BEAST_DOXYGEN
 /// A typical HTTP request header
 template<class Fields = fields>
 using request_header = header<true, Fields>;
 
 /// A typical HTTP response header
 template<class Fields = fields>
 using response_header = header<false, Fields>;
 #endif
 
 #if defined(BOOST_MSVC)
 // Workaround for MSVC bug with private base classes
 namespace detail {
 template<class T>
 using value_type_t = typename T::value_type;
 } // detail
 #endif
 
 /** A container for a complete HTTP message.
 
     This container is derived from the `Fields` template type.
     To understand all of the members of this class it is necessary
     to view the declaration for the `Fields` type. When using
     the default fields container, those declarations are in
     @ref fields.
 
     A message can be a request or response, depending on the
     `isRequest` template argument value. Requests and responses
     have different types; functions may be overloaded based on
     the type if desired.
 
     The `Body` template argument type determines the model used
     to read or write the content body of the message.
 
     Newly constructed messages objects have version set to
     HTTP/1.1. Newly constructed response objects also have
     result code set to @ref status::ok.
 
     @tparam isRequest `true` if this represents a request,
     or `false` if this represents a response. Some class data
     members are conditionally present depending on this value.
 
     @tparam Body A type meeting the requirements of Body.
 
     @tparam Fields The type of container used to hold the
     field value pairs.
 */
 #if BOOST_BEAST_DOXYGEN
 template<bool isRequest, class Body, class Fields = fields>
 #else
 template<bool isRequest, class Body, class Fields>
 #endif
 class message
     : public header<isRequest, Fields>
 #if ! BOOST_BEAST_DOXYGEN
     , boost::empty_value<
         typename Body::value_type>
 #endif
 {
 public:
     /// The base class used to hold the header portion of the message.
     using header_type = header<isRequest, Fields>;
 
     /** The type providing the body traits.
 
         The @ref message::body member will be of type `body_type::value_type`.
     */
     using body_type = Body;
 
     /// Constructor
     message() = default;
 
     /// Constructor
     message(message&&) = default;
 
     /// Constructor
     message(message const&) = default;
 
     /// Assignment
     message& operator=(message&&) = default;
 
     /// Assignment
     message& operator=(message const&) = default;
 
     /** Constructor
 
         @param h The header to move construct from.
 
         @param body_args Optional arguments forwarded
         to the `body` constructor.
     */
     template<class... BodyArgs>
     explicit
     message(header_type&& h, BodyArgs&&... body_args);
 
     /** Constructor.
 
         @param h The header to copy construct from.
 
         @param body_args Optional arguments forwarded
         to the `body` constructor.
     */
     template<class... BodyArgs>
     explicit
     message(header_type const& h, BodyArgs&&... body_args);
 
     /** Constructor
 
         @param method The request-method to use.
 
         @param target The request-target.
 
         @param version The HTTP-version.
 
         @note This function is only available when `isRequest == true`.
     */
 #if BOOST_BEAST_DOXYGEN
     message(verb method, string_view target, unsigned version);
 #else
     template<class Version,
         class = typename std::enable_if<isRequest &&
             std::is_convertible<Version, unsigned>::value>::type>
     message(verb method, string_view target, Version version);
 #endif
 
     /** Constructor
 
         @param method The request-method to use.
 
         @param target The request-target.
 
         @param version The HTTP-version.
 
         @param body_arg An argument forwarded to the `body` constructor.
 
         @note This function is only available when `isRequest == true`.
     */
 #if BOOST_BEAST_DOXYGEN
     template<class BodyArg>
     message(verb method, string_view target,
         unsigned version, BodyArg&& body_arg);
 #else
     template<class Version, class BodyArg,
         class = typename std::enable_if<isRequest &&
             std::is_convertible<Version, unsigned>::value>::type>
     message(verb method, string_view target,
         Version version, BodyArg&& body_arg);
 #endif
 
     /** Constructor
 
         @param method The request-method to use.
 
         @param target The request-target.
 
         @param version The HTTP-version.
 
         @param body_arg An argument forwarded to the `body` constructor.
 
         @param fields_arg An argument forwarded to the `Fields` constructor.
 
         @note This function is only available when `isRequest == true`.
     */
 #if BOOST_BEAST_DOXYGEN
     template<class BodyArg, class FieldsArg>
     message(verb method, string_view target, unsigned version,
         BodyArg&& body_arg, FieldsArg&& fields_arg);
 #else
     template<class Version, class BodyArg, class FieldsArg,
         class = typename std::enable_if<isRequest &&
             std::is_convertible<Version, unsigned>::value>::type>
     message(verb method, string_view target, Version version,
         BodyArg&& body_arg, FieldsArg&& fields_arg);
 #endif
 
     /** Constructor
 
         @param result The status-code for the response.
 
         @param version The HTTP-version.
 
         @note This member is only available when `isRequest == false`.
     */
 #if BOOST_BEAST_DOXYGEN
     message(status result, unsigned version);
 #else
     template<class Version,
         class = typename std::enable_if<! isRequest &&
            std::is_convertible<Version, unsigned>::value>::type>
     message(status result, Version version);
 #endif
 
     /** Constructor
 
         @param result The status-code for the response.
 
         @param version The HTTP-version.
 
         @param body_arg An argument forwarded to the `body` constructor.
 
         @note This member is only available when `isRequest == false`.
     */
 #if BOOST_BEAST_DOXYGEN
     template<class BodyArg>
     message(status result, unsigned version, BodyArg&& body_arg);
 #else
     template<class Version, class BodyArg,
         class = typename std::enable_if<! isRequest &&
            std::is_convertible<Version, unsigned>::value>::type>
     message(status result, Version version, BodyArg&& body_arg);
 #endif
 
     /** Constructor
 
         @param result The status-code for the response.
 
         @param version The HTTP-version.
 
         @param body_arg An argument forwarded to the `body` constructor.
 
         @param fields_arg An argument forwarded to the `Fields` base class constructor.
 
         @note This member is only available when `isRequest == false`.
     */
 #if BOOST_BEAST_DOXYGEN
     template<class BodyArg, class FieldsArg>
     message(status result, unsigned version,
         BodyArg&& body_arg, FieldsArg&& fields_arg);
 #else
     template<class Version, class BodyArg, class FieldsArg,
         class = typename std::enable_if<! isRequest &&
            std::is_convertible<Version, unsigned>::value>::type>
     message(status result, Version version,
         BodyArg&& body_arg, FieldsArg&& fields_arg);
 #endif
 
     /** Constructor
 
         The header and body are default-constructed.
     */
     explicit
     message(std::piecewise_construct_t);
 
     /** Construct a message.
 
         @param body_args A tuple forwarded as a parameter
         pack to the body constructor.
     */
     template<class... BodyArgs>
     message(std::piecewise_construct_t,
         std::tuple<BodyArgs...> body_args);
 
     /** Construct a message.
 
         @param body_args A tuple forwarded as a parameter
         pack to the body constructor.
 
         @param fields_args A tuple forwarded as a parameter
         pack to the `Fields` constructor.
     */
     template<class... BodyArgs, class... FieldsArgs>
     message(std::piecewise_construct_t,
         std::tuple<BodyArgs...> body_args,
         std::tuple<FieldsArgs...> fields_args);
 
     /// Returns the header portion of the message
     header_type const&
     base() const
     {
         return *this;
     }
 
     /// Returns the header portion of the message
     header_type&
     base()
     {
         return *this;
     }
 
     /// Returns `true` if the chunked Transfer-Encoding is specified
     bool
     chunked() const
     {
         return this->get_chunked_impl();
     }
 
     /** Set or clear the chunked Transfer-Encoding
 
         This function will set or remove the "chunked" transfer
         encoding as the last item in the list of encodings in the
         field.
 
         If the result of removing the chunked token results in an
         empty string, the field is erased.
 
         The Content-Length field is erased unconditionally.
     */
     void
     chunked(bool value);
 
     /** Returns `true` if the Content-Length field is present.
 
         This function inspects the fields and returns `true` if
         the Content-Length field is present. The properties of the
         body are not checked, this only looks for the field.
     */
     bool
     has_content_length() const
     {
         return this->has_content_length_impl();
     }
 
     /** Set or clear the Content-Length field
 
         This function adjusts the Content-Length field as follows:
 
         @li If `value` specifies a value, the Content-Length field
           is set to the value. Otherwise
 
         @li The Content-Length field is erased.
 
         If "chunked" token appears as the last item in the
         Transfer-Encoding field it is unconditionally removed.
 
         @param value The value to set for Content-Length.
     */
     void
     content_length(boost::optional<std::uint64_t> const& value);
 
     /** Returns `true` if the message semantics indicate keep-alive
 
         The value depends on the version in the message, which must
         be set to the final value before this function is called or
         else the return value is unreliable.
     */
     bool
     keep_alive() const
     {
         return this->get_keep_alive_impl(this->version());
     }
 
     /** Set the keep-alive message semantic option
 
         This function adjusts the Connection field to indicate
         whether or not the connection should be kept open after
         the corresponding response. The result depends on the
         version set on the message, which must be set to the
         final value before making this call.
 
         @param value `true` if the connection should persist.
     */
     void
     keep_alive(bool value)
     {
         this->set_keep_alive_impl(this->version(), value);
     }
 
     /** Returns `true` if the message semantics require an end of file.
 
         For HTTP requests, this function returns the logical
         NOT of a call to @ref keep_alive.
 
         For HTTP responses, this function returns the logical NOT
         of a call to @ref keep_alive if any of the following are true:
 
         @li @ref has_content_length would return `true`
 
         @li @ref chunked would return `true`
 
         @li @ref result returns @ref status::no_content
 
         @li @ref result returns @ref status::not_modified
 
         @li @ref result returns any informational status class (100 to 199)
 
         Otherwise, the function returns `true`.
 
         @see https://tools.ietf.org/html/rfc7230#section-3.3
     */
     bool
     need_eof() const
     {
         return need_eof(typename header_type::is_request{});
     }
 
     /** Returns the payload size of the body in octets if possible.
 
         This function invokes the <em>Body</em> algorithm to measure
         the number of octets in the serialized body container. If
         there is no body, this will return zero. Otherwise, if the
         body exists but is not known ahead of time, `boost::none`
         is returned (usually indicating that a chunked Transfer-Encoding
         will be used).
 
         @note The value of the Content-Length field in the message
         is not inspected.
     */
     boost::optional<std::uint64_t>
     payload_size() const;
 
     /** Prepare the message payload fields for the body.
 
         This function will adjust the Content-Length and
         Transfer-Encoding field values based on the properties
         of the body.
 
         @par Example
         @code
         request<string_body> req{verb::post, "/"};
         req.set(field::user_agent, "Beast");
         req.body() = "Hello, world!";
         req.prepare_payload();
         @endcode
 
         @note
 
         This function is not necessary to call in the following situations:
 
         @li The request doesn't contain a body, such as in a GET or HEAD request.
         @li The Content-Length and Transfer-Encoding are set manually.
     */
     void
     prepare_payload()
     {
         prepare_payload(typename header_type::is_request{});
     }
 
     /// Returns the body
 #if BOOST_BEAST_DOXYGEN || ! defined(BOOST_MSVC)
     typename body_type::value_type&
 #else
     detail::value_type_t<Body>&
 #endif
     body()& noexcept
     {
         return this->boost::empty_value<
             typename Body::value_type>::get();
     }
 
     /// Returns the body
 #if BOOST_BEAST_DOXYGEN || ! defined(BOOST_MSVC)
     typename body_type::value_type&&
 #else
     detail::value_type_t<Body>&&
 #endif
     body()&& noexcept
     {
         return std::move(
             this->boost::empty_value<
                 typename Body::value_type>::get());
     }
 
     /// Returns the body
 #if BOOST_BEAST_DOXYGEN || ! defined(BOOST_MSVC)
     typename body_type::value_type const&
 #else
     detail::value_type_t<Body> const&
 #endif
     body() const& noexcept
     {
         return this->boost::empty_value<
             typename Body::value_type>::get();
     }
 
 private:
     static_assert(is_body<Body>::value,
         "Body type requirements not met");
 
     template<
         class... BodyArgs,
         std::size_t... IBodyArgs>
     message(
         std::piecewise_construct_t,
         std::tuple<BodyArgs...>& body_args,
         mp11::index_sequence<IBodyArgs...>)
         : boost::empty_value<
             typename Body::value_type>(boost::empty_init_t(),
                 std::forward<BodyArgs>(
                 std::get<IBodyArgs>(body_args))...)
     {
         boost::ignore_unused(body_args);
     }
 
     template<
         class... BodyArgs,
         class... FieldsArgs,
         std::size_t... IBodyArgs,
         std::size_t... IFieldsArgs>
     message(
         std::piecewise_construct_t,
         std::tuple<BodyArgs...>& body_args,
         std::tuple<FieldsArgs...>& fields_args,
         mp11::index_sequence<IBodyArgs...>,
         mp11::index_sequence<IFieldsArgs...>)
         : header_type(std::forward<FieldsArgs>(
             std::get<IFieldsArgs>(fields_args))...)
         , boost::empty_value<
             typename Body::value_type>(boost::empty_init_t(),
                 std::forward<BodyArgs>(
                 std::get<IBodyArgs>(body_args))...)
     {
         boost::ignore_unused(body_args);
         boost::ignore_unused(fields_args);
     }
 
     bool
     need_eof(std::true_type) const
     {
         return ! keep_alive();
     }
 
     bool
     need_eof(std::false_type) const;
 
     boost::optional<std::uint64_t>
     payload_size(std::true_type) const
     {
         return Body::size(this->body());
     }
 
     boost::optional<std::uint64_t>
     payload_size(std::false_type) const
     {
         return boost::none;
     }
 
     void
     prepare_payload(std::true_type);
 
     void
     prepare_payload(std::false_type);
 };
 
 #if BOOST_BEAST_DOXYGEN
 /// A typical HTTP request
 template<class Body, class Fields = fields>
 using request = message<true, Body, Fields>;
 
 /// A typical HTTP response
 template<class Body, class Fields = fields>
 using response = message<false, Body, Fields>;
 #endif
 
 //------------------------------------------------------------------------------
 
 #if BOOST_BEAST_DOXYGEN
 /** Swap two header objects.
 
     @par Requirements
     `Fields` is @b Swappable.
 */
 template<bool isRequest, class Fields>
 void
 swap(
     header<isRequest, Fields>& m1,
     header<isRequest, Fields>& m2);
 #endif
 
 /** Swap two message objects.
 
     @par Requirements:
     `Body::value_type` and `Fields` are @b Swappable.
 */
 template<bool isRequest, class Body, class Fields>
 void
 swap(
     message<isRequest, Body, Fields>& m1,
     message<isRequest, Body, Fields>& m2);
 
 } // http
 } // beast
 } // boost
 
 #include <boost/beast/http/impl/message.hpp>
 
 #endif

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