message: Allows the websocket client to send empty packet.
diff: @@ -1213,9 +1213,7 @@ static PHP_METHOD(swoole_http_client, __construct)
  }
  zend_update_property_stringl(swoole_http_client_class_entry_ptr, getThis(), ZEND_STRL("host"), host, host_len TSRMLS_CC);
  -
  - zend_update_property_long(swoole_http_client_class_entry_ptr,
  - getThis(), ZEND_STRL("port"), port TSRMLS_CC);
  + zend_update_property_long(swoole_http_client_class_entry_ptr, getThis(), ZEND_STRL("port"), port TSRMLS_CC);
  //init
  swoole_set_object(getThis(), NULL);
  @@ -1949,12 +1947,6 @@ static PHP_METHOD(swoole_http_client, push)
  RETURN_FALSE;
  }
  - if (length == 0)
  - {
  - swoole_php_fatal_error(E_WARNING, "data is empty.");
  - RETURN_FALSE;
  - }
  -
  http_client *http = swoole_get_object(getThis());
  if (!http->cli)
  {
  