add support for websockets in the reverse proxy

add test_http_client_ws_msg_in

add httpclient test for sending websocket messages

implement httpclient websocket IO

add nsapi_set_saf_return_callback as preparation for proxy saf testing

httpclient: prepare httpstream for websockets

(0) -300 -100 -30 -10 -6 +6 +10 tip

mercurial