• close_code : boost::beast::websocket
• error : boost::beast::http , boost::beast::websocket , boost::beast::zlib
• field : boost::beast::http
• file_mode : boost::beast
• Flush : boost::beast::zlib
• frame_type : boost::beast::websocket
• Method : http
• opcode : boost::beast::websocket::detail
• role_type : boost::beast::websocket
• status : boost::beast::http
• status_class : boost::beast::http
• Strategy : boost::beast::zlib
• verb : boost::beast::http
• z_Compression : boost::beast::zlib
• z_Type : boost::beast::zlib