message: Set the websocket_mask default value to true a client MUST mask all frames that it sends to the server).
diff: @@ -86,7 +86,7 @@ public:
  bool websocket = false; // if upgrade successfully
  bool gzip = false; // enable gzip
  bool chunked = false; // Transfer-Encoding: chunked
  - bool websocket_mask = false; // enable websocket mask
  + bool websocket_mask = true; // enable websocket mask
  bool is_download = false; // save http response to file
  int download_file_fd = 0;
  bool has_upload_files = false;
  