Section 3.4 in RFC8835 states that if a WebRTC endpoint uses an HTTP proxy to access the Internet it MUST include the "ALPN" header. This commit adds this header.
By default the ALPN used when connecting to the TURN/TCP server via a proxy is set to "webrtc". It can be changed by adding an alpn url option for the http-proxy. For example:
http://user:pass@my.http.proxy.com:8080?alpn=c-webrtc
This will add the header "ALPN: c-webrtc" to the HTTP proxy CONNECT request.