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diff --git a/boost/beast/http/basic_dynamic_body.hpp b/boost/beast/http/basic_dynamic_body.hpp
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+++ b/boost/beast/http/basic_dynamic_body.hpp
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+//
+// Copyright (c) 2016-2017 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_BASIC_DYNAMIC_BODY_HPP
+#define BOOST_BEAST_HTTP_BASIC_DYNAMIC_BODY_HPP
+
+#include <boost/beast/core/detail/config.hpp>
+#include <boost/beast/core/type_traits.hpp>
+#include <boost/beast/http/error.hpp>
+#include <boost/beast/http/message.hpp>
+#include <boost/optional.hpp>
+#include <algorithm>
+#include <cstdint>
+#include <utility>
+
+namespace boost {
+namespace beast {
+namespace http {
+
+/** A @b Body using a @b DynamicBuffer
+
+    This body uses a @b DynamicBuffer as a memory-based container
+    for holding message payloads. Messages using this body type
+    may be serialized and parsed.
+*/
+template<class DynamicBuffer>
+struct basic_dynamic_body
+{
+    static_assert(
+        boost::asio::is_dynamic_buffer<DynamicBuffer>::value,
+        "DynamicBuffer requirements not met");
+
+    /** The type of container used for the body
+
+        This determines the type of @ref message::body
+        when this body type is used with a message container.
+    */
+    using value_type = DynamicBuffer;
+
+    /** Returns the payload size of the body
+
+        When this body is used with @ref message::prepare_payload,
+        the Content-Length will be set to the payload size, and
+        any chunked Transfer-Encoding will be removed.
+    */
+    static
+    std::uint64_t
+    size(value_type const& v)
+    {
+        return v.size();
+    }
+
+    /** The algorithm for parsing the body
+
+        Meets the requirements of @b BodyReader.
+    */
+#if BOOST_BEAST_DOXYGEN
+    using reader = implementation_defined;
+#else
+    class reader
+    {
+        value_type& body_;
+
+    public:
+        template<bool isRequest, class Fields>
+        explicit
+        reader(message<isRequest,
+                basic_dynamic_body, Fields>& msg)
+            : body_(msg.body())
+        {
+        }
+
+        void
+        init(boost::optional<
+            std::uint64_t> const&, error_code& ec)
+        {
+            ec.assign(0, ec.category());
+        }
+
+        template<class ConstBufferSequence>
+        std::size_t
+        put(ConstBufferSequence const& buffers,
+            error_code& ec)
+        {
+            using boost::asio::buffer_copy;
+            using boost::asio::buffer_size;
+            auto const n = buffer_size(buffers);
+            if(body_.size() > body_.max_size() - n)
+            {
+                ec = error::buffer_overflow;
+                return 0;
+            }
+            boost::optional<typename
+                DynamicBuffer::mutable_buffers_type> b;
+            try
+            {
+                b.emplace(body_.prepare((std::min)(n,
+                    body_.max_size() - body_.size())));
+            }
+            catch(std::length_error const&)
+            {
+                ec = error::buffer_overflow;
+                return 0;
+            }
+            ec.assign(0, ec.category());
+            auto const bytes_transferred =
+                buffer_copy(*b, buffers);
+            body_.commit(bytes_transferred);
+            return bytes_transferred;
+        }
+
+        void
+        finish(error_code& ec)
+        {
+            ec.assign(0, ec.category());
+        }
+    };
+#endif
+
+    /** The algorithm for serializing the body
+
+        Meets the requirements of @b BodyWriter.
+    */
+#if BOOST_BEAST_DOXYGEN
+    using writer = implementation_defined;
+#else
+    class writer
+    {
+        DynamicBuffer const& body_;
+
+    public:
+        using const_buffers_type =
+            typename DynamicBuffer::const_buffers_type;
+
+        template<bool isRequest, class Fields>
+        explicit
+        writer(message<isRequest,
+                basic_dynamic_body, Fields> const& m)
+            : body_(m.body())
+        {
+        }
+
+        void
+        init(error_code& ec)
+        {
+            ec.assign(0, ec.category());
+        }
+
+        boost::optional<std::pair<const_buffers_type, bool>>
+        get(error_code& ec)
+        {
+            ec.assign(0, ec.category());
+            return {{body_.data(), false}};
+        }
+    };
+#endif
+};
+
+} // http
+} // beast
+} // boost
+
+#endif