code: @Override
      protected void addRequestHandler(String requestId, IClientRequestHandler requestHandler) {
      	super.addRequestHandler(requestId, requestHandler);
      	registerClientRequestHandler(requestId, requestHandler);
      }
docs: /* (non-Javadoc)
  @see com.smartfoxserver.v2.extensions.SFSExtension#addRequestHandler(java.lang.String, com.smartfoxserver.v2.extensions.IClientRequestHandler)