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diff --git a/doc/html/boost_asio/example/cpp03/http/server4/file_handler.hpp b/doc/html/boost_asio/example/cpp03/http/server4/file_handler.hpp
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+//
+// file_handler.hpp
+// ~~~~~~~~~~~~~~~~
+//
+// Copyright (c) 2003-2017 Christopher M. Kohlhoff (chris at kohlhoff 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)
+//
+
+#ifndef HTTP_SERVER4_FILE_HANDLER_HPP
+#define HTTP_SERVER4_FILE_HANDLER_HPP
+
+#include <string>
+
+namespace http {
+namespace server4 {
+
+struct reply;
+struct request;
+
+/// The common handler for all incoming requests.
+class file_handler
+{
+public:
+  /// Construct with a directory containing files to be served.
+  explicit file_handler(const std::string& doc_root);
+
+  /// Handle a request and produce a reply.
+  void operator()(const request& req, reply& rep);
+
+private:
+  /// The directory containing the files to be served.
+  std::string doc_root_;
+
+  /// Perform URL-decoding on a string. Returns false if the encoding was
+  /// invalid.
+  static bool url_decode(const std::string& in, std::string& out);
+};
+
+} // namespace server4
+} // namespace http
+
+#endif // HTTP_SERVER4_FILE_HANDLER_HPP