diff --git a/websocket-sharp/Server/WebSocketBehavior.cs b/websocket-sharp/Server/WebSocketBehavior.cs
index c0ea719b..33519aa2 100644
--- a/websocket-sharp/Server/WebSocketBehavior.cs
+++ b/websocket-sharp/Server/WebSocketBehavior.cs
@@ -47,6 +47,7 @@ namespace WebSocketSharp.Server
     private WebSocketContext                               _context;
     private Func<CookieCollection, CookieCollection, bool> _cookiesValidator;
     private string                                         _id;
+    private bool                                           _ignoreExtensions;
     private Func<string, bool>                             _originValidator;
     private string                                         _protocol;
     private WebSocketSessionManager                        _sessions;
@@ -159,6 +160,24 @@ namespace WebSocketSharp.Server
       }
     }
 
+    /// <summary>
+    /// Gets or sets a value indicating whether the WebSocket service ignores
+    /// the Sec-WebSocket-Extensions header included in a connection request.
+    /// </summary>
+    /// <value>
+    /// <c>true</c> if the WebSocket service ignores the extensions; otherwise, <c>false</c>.
+    /// The default value is <c>false</c>.
+    /// </value>
+    public bool IgnoreExtensions {
+      get {
+        return _ignoreExtensions;
+      }
+
+      set {
+        _ignoreExtensions = value;
+      }
+    }
+
     /// <summary>
     /// Gets or sets the delegate called to validate the Origin header included in a connection
     /// request to the WebSocket service.
@@ -316,6 +335,7 @@ namespace WebSocketSharp.Server
 
       _websocket = context.WebSocket;
       _websocket.CustomHandshakeRequestChecker = checkIfValidConnectionRequest;
+      _websocket.IgnoreExtensions = _ignoreExtensions;
       _websocket.Protocol = _protocol;
 
       var waitTime = sessions.WaitTime;
diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index b1b85c9c..3b674328 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -86,6 +86,7 @@ namespace WebSocketSharp
     private const string            _guid = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
     private Func<WebSocketContext, string>
                                     _handshakeRequestChecker;
+    private bool                    _ignoreExtensions;
     private volatile Logger         _logger;
     private Queue<MessageEventArgs> _messageEventQueue;
     private uint                    _nonceCount;
@@ -225,6 +226,17 @@ namespace WebSocketSharp
       }
     }
 
+    // As server
+    internal bool IgnoreExtensions {
+      get {
+        return _ignoreExtensions;
+      }
+
+      set {
+        _ignoreExtensions = value;
+      }
+    }
+
     internal bool IsConnected {
       get {
         return _readyState == WebSocketState.Open || _readyState == WebSocketState.Closing;
@@ -577,9 +589,11 @@ namespace WebSocketSharp
           !_context.SecWebSocketProtocols.Contains (protocol => protocol == _protocol))
         _protocol = null;
 
-      var extensions = _context.Headers["Sec-WebSocket-Extensions"];
-      if (extensions != null && extensions.Length > 0)
-        processSecWebSocketExtensionsHeader (extensions);
+      if (!_ignoreExtensions) {
+        var extensions = _context.Headers["Sec-WebSocket-Extensions"];
+        if (extensions != null && extensions.Length > 0)
+          processSecWebSocketExtensionsHeader (extensions);
+      }
 
       return sendHttpResponse (createHandshakeResponse ());
     }