diff --git a/websocket-sharp/Net/HttpListenerRequest.cs b/websocket-sharp/Net/HttpListenerRequest.cs
index feefbc82..1327092c 100644
--- a/websocket-sharp/Net/HttpListenerRequest.cs
+++ b/websocket-sharp/Net/HttpListenerRequest.cs
@@ -462,14 +462,6 @@ namespace WebSocketSharp.Net
 
     #region Private Methods
 
-    private bool keepAlive ()
-    {
-      var comparison = StringComparison.OrdinalIgnoreCase;
-      return _version > HttpVersion.Version10
-             ? !_headers.Contains ("Connection", "close", comparison)
-             : _headers.Contains ("Connection", "keep-alive", comparison);
-    }
-
     private static bool tryCreateVersion (string version, out Version result)
     {
       try {