[Modify] Polish it

websocket-sharp/Net/HttpConnection.cs

@@ -331,8 +331,15 @@ namespace WebSocketSharp.Net
           return;
         }
 
+        try {
           conn._stream.BeginRead (conn._buffer, 0, _bufferLength, onRead, conn);
         }
+        catch (Exception) {
+          // TODO: Logging.
+
+          conn.close ();
+        }
+      }
     }
 
     private static void onTimeout (object state)