Add HttpRequest::requestedUri.

sdk/lib/io/http_impl.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.io;
 
 const int _HEADERS_BUFFER_SIZE = 8 * 1024;
 
 class _HttpIncoming extends Stream<List<int>> {
   final int _transferLength;
@@ skipping 72 matching lines @@
 
 class _HttpRequest extends _HttpInboundMessage implements HttpRequest {
   final HttpResponse response;
 
   final _HttpServer _httpServer;
 
   final _HttpConnection _httpConnection;
 
   _HttpSession _session;
 
+  Uri _requestedUri;
+
   _HttpRequest(_HttpResponse this.response,
                _HttpIncoming _incoming,
                _HttpServer this._httpServer,
                _HttpConnection this._httpConnection)
       : super(_incoming) {
     if (headers.protocolVersion == "1.1") {
       response.headers.chunkedTransferEncoding = true;
       response.headers.persistentConnection = headers.persistentConnection;
     }
 
@@ skipping 17 matching lines @@
                                         void onDone(),
                                         bool cancelOnError}) {
     return _incoming.listen(onData,
                             onError: onError,
                             onDone: onDone,
                             cancelOnError: cancelOnError);
   }
 
   Uri get uri => _incoming.uri;
 
+  Uri get requestedUri {
+    if (_requestedUri == null) {
+      var proto = headers['x-forwarded-proto'];
+      var scheme = proto != null ? proto.first :
+          _httpConnection._socket is SecureSocket ? "https" : "http";
+      var host = headers['x-forwarded-host'];
+      if (host != null) {
+        host = host.first;
+      } else {
+        host = headers['host'];
+        if (host != null) {
+          host = host.first;
+        } else {
+          host = "${_httpServer.address.host}:${_httpServer.port}";
+        }
+      }
+      _requestedUri = Uri.parse("$scheme://$host$uri");
+    }
+    return _requestedUri;
+  }
+
   String get method => _incoming.method;
 
   HttpSession get session {
     if (_session != null) {
       if (_session._destroyed) {
         // It's destroyed, clear it.
         _session = null;
         // Create new session object by calling recursive.
         return session;
       }
@@ skipping 2441 matching lines @@
 
 String _getHttpVersion() {
   var version = Platform.version;
   // Only include major and minor version numbers.
   int index = version.indexOf('.', version.indexOf('.') + 1);
   version = version.substring(0, index);
   return 'Dart/$version (dart:io)';
 }