Fixed a bug in the connect_timeout_cp class that caused the program to crash. Fixed a bug in the ws_stream_cp class that causes program assertions to fail under debug mode. Fixed a bug in the rpc module that caused the program to crash after receiving illegal data. Rewrote the rpc_call_cp class code to support chained calls. Rewrote the api of http and websocket class. Rewrote the example code. Fixed and optimized the code for auto reconnection. A standalone version of Beast was added to support headonly http and websocket capabilities,now all functionality is no longer dependent on the Boost library. Rename the timeout function of rpc_client and rpc_session class to default_timeout function. Fixed compile warnings and errors under clang. Compiled under msvc(vs2017 vs2019) gcc8.2.0 clang10. Add event_guard class to enhance the reliability of event handle. Remove some class, the files is : httpws_server.hpp,httpws_session.hpp,httpwss_server.hpphttpwss_session.hpp; Various code fixes and improvements.