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diff --git a/boost/beast/websocket/impl/rfc6455.ipp b/boost/beast/websocket/impl/rfc6455.ipp
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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_WEBSOCKET_IMPL_RFC6455_IPP
+#define BOOST_BEAST_WEBSOCKET_IMPL_RFC6455_IPP
+
+#include <boost/beast/http/fields.hpp>
+#include <boost/beast/http/rfc7230.hpp>
+
+namespace boost {
+namespace beast {
+namespace websocket {
+
+template<class Allocator>
+bool
+is_upgrade(http::header<true,
+    http::basic_fields<Allocator>> const& req)
+{
+    if(req.version() < 11)
+        return false;
+    if(req.method() != http::verb::get)
+        return false;
+    if(! http::token_list{req["Connection"]}.exists("upgrade"))
+        return false;
+    if(! http::token_list{req["Upgrade"]}.exists("websocket"))
+        return false;
+    return true;
+}
+
+} // websocket
+} // beast
+} // boost
+
+#endif