[SR-Users] Re: SIP parse error for self-generated Websocket reply

Hello, We try to introduce a small websocket sidecar to our Kamailio servers, which runs on the same host. It connects to the regular TCP socket of our Kamailios, and in the XHTTP request route, we do just this:         if path == "/sidecar":             KSR.websocket.handle_handshake()             return 1 On every new connect, Kamailio logs a parse error for the reply it generates. Sep 11 15:42:35 sipproxy /usr/sbin/kamailio[552]: ERROR: <core> [core/parser/parse_fline.c:272]: parse_first_line(): parse_first_line: bad message (offset: 22) Sep 11 15:42:35 sipproxy /usr/sbin/kamailio[552]: ERROR: <core> [core/parser/msg_parser.c:790]: parse_msg(): ERROR: parse_msg: message=<HTTP/1.1 101 Switching Protocols                                                   Sia: SIP/2.0/TCP 100.74.11.1:46422                                                   Sec-WebSocket-Protocol: sip                                                   Upgrade: websocket                                                   Connection: upgrade                                                   Sec-WebSocket-Accept: 60dPbzcRW6up7z92kDlxkqL2WlY=                                                   Content-Length: 0 Sep 11 15:42:35 sipproxy /usr/sbin/kamailio[552]: ERROR: <core> [core/msg_translator.c:3402]: build_sip_msg_from_buf(): parsing failed I saw this error in other questions from a while ago, but without a solution. What could be the reason for this?