diff --git a/websocket-sharp/Net/HttpListenerRequest.cs b/websocket-sharp/Net/HttpListenerRequest.cs
index 41521947..fafa4729 100644
--- a/websocket-sharp/Net/HttpListenerRequest.cs
+++ b/websocket-sharp/Net/HttpListenerRequest.cs
@@ -544,40 +544,9 @@ namespace WebSocketSharp.Net
       if (noHost)
         host = UserHostAddress;
 
-      string scheme = null;
-      string path = null;
-      if (_uri.StartsWith ("/")) {
-        path = _uri;
-      }
-      else if (_uri.MaybeUri ()) {
-        Uri uri;
-        if (!Uri.TryCreate (_uri, UriKind.Absolute, out uri) ||
-            !(uri.Scheme.StartsWith ("http") || uri.Scheme.StartsWith ("ws"))) {
-          _context.ErrorMessage = "Invalid request url: " + _uri;
-          return;
-        }
-
-        scheme = uri.Scheme;
-        host = uri.Authority;
-        path = uri.PathAndQuery;
-      }
-      else if (_uri == "*") {
-      }
-      else {
-        // As authority form
-        host = _uri;
-      }
-
-      if (scheme == null)
-        scheme = (IsWebSocketRequest ? "ws" : "http") + (IsSecureConnection ? "s" : String.Empty);
-
-      var colon = host.IndexOf (':');
-      if (colon == -1)
-        host = String.Format ("{0}:{1}", host, scheme == "http" || scheme == "ws" ? 80 : 443);
-
-      var url = String.Format ("{0}://{1}{2}", scheme, host, path);
-      if (!Uri.TryCreate (url, UriKind.Absolute, out _url)) {
-        _context.ErrorMessage = "Invalid request url: " + url;
+      _url = HttpUtility.CreateRequestUrl (_uri, host, IsWebSocketRequest, IsSecureConnection);
+      if (_url == null) {
+        _context.ErrorMessage = "Invalid request url";
         return;
       }
 
diff --git a/websocket-sharp/Net/HttpUtility.cs b/websocket-sharp/Net/HttpUtility.cs
index a4b52e4c..527321a9 100644
--- a/websocket-sharp/Net/HttpUtility.cs
+++ b/websocket-sharp/Net/HttpUtility.cs
@@ -629,6 +629,52 @@ namespace WebSocketSharp.Net
       return hash (String.Format ("{0}:{1}", secret, data));
     }
 
+    internal static Uri CreateRequestUrl (
+      string requestUri, string host, bool websocketRequest, bool secure)
+    {
+      if (requestUri == null || requestUri.Length == 0 || host == null || host.Length == 0)
+        return null;
+
+      string scheme = null;
+      string path = null;
+      if (requestUri.StartsWith ("/")) {
+        path = requestUri;
+      }
+      else if (requestUri.MaybeUri ()) {
+        Uri uri;
+        var valid = Uri.TryCreate (requestUri, UriKind.Absolute, out uri) &&
+                    (((scheme = uri.Scheme).StartsWith ("http") && !websocketRequest) ||
+                     (scheme.StartsWith ("ws") && websocketRequest));
+
+        if (!valid)
+          return null;
+
+        host = uri.Authority;
+        path = uri.PathAndQuery;
+      }
+      else if (requestUri == "*") {
+      }
+      else {
+        // As authority form
+        host = requestUri;
+      }
+
+      if (scheme == null)
+        scheme = (websocketRequest ? "ws" : "http") + (secure ? "s" : String.Empty);
+
+      var colon = host.IndexOf (':');
+      if (colon == -1)
+        host = String.Format ("{0}:{1}", host, scheme == "http" || scheme == "ws" ? 80 : 443);
+
+      var url = String.Format ("{0}://{1}{2}", scheme, host, path);
+
+      Uri res;
+      if (!Uri.TryCreate (url, UriKind.Absolute, out res))
+        return null;
+
+      return res;
+    }
+
     internal static void ParseQueryString (
       string query, Encoding encoding, NameValueCollection result)
     {
diff --git a/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs b/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs
index aa0d9364..90787d57 100644
--- a/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs
+++ b/websocket-sharp/Net/WebSockets/TcpListenerWebSocketContext.cs
@@ -66,7 +66,9 @@ namespace WebSocketSharp.Net.WebSockets
       _secure = secure;
       _stream = WebSocketStream.CreateServerStream (client, secure, cert);
       _request = _stream.ReadHandshake<HandshakeRequest> (HandshakeRequest.Parse, 90000);
-      _uri = createRequestUrl (_request, secure);
+      _uri = HttpUtility.CreateRequestUrl (
+        _request.RequestUri, _request.Headers ["Host"], _request.IsWebSocketRequest, secure);
+
       _websocket = new WebSocket (this, protocol, logger);
     }
 
@@ -308,56 +310,6 @@ namespace WebSocketSharp.Net.WebSockets
 
     #endregion
 
-    #region Private Methods
-
-    private static Uri createRequestUrl (HandshakeRequest request, bool secure)
-    {
-      var host = request.Headers ["Host"];
-      if (host == null || host.Length == 0)
-        return null;
-
-      string scheme = null;
-      string path = null;
-
-      var reqUri = request.RequestUri;
-      if (reqUri.StartsWith ("/")) {
-        path = reqUri;
-      }
-      else if (reqUri.MaybeUri ()) {
-        Uri uri;
-        if (!Uri.TryCreate (reqUri, UriKind.Absolute, out uri) ||
-            !uri.Scheme.StartsWith ("ws"))
-          return null;
-
-        scheme = uri.Scheme;
-        host = uri.Authority;
-        path = uri.PathAndQuery;
-      }
-      else if (reqUri == "*") {
-      }
-      else {
-        // As authority form
-        host = reqUri;
-      }
-
-      if (scheme == null)
-        scheme = secure ? "wss" : "ws";
-
-      var colon = host.IndexOf (':');
-      if (colon == -1)
-        host = String.Format ("{0}:{1}", host, scheme == "ws" ? 80 : 443);
-
-      var url = String.Format ("{0}://{1}{2}", scheme, host, path);
-
-      Uri res;
-      if (!Uri.TryCreate (url, UriKind.Absolute, out res))
-        return null;
-
-      return res;
-    }
-
-    #endregion
-
     #region Internal Methods
 
     internal void Close ()