Allow running fully on port 443 (wss:// is hardcoded to use 8443 in minified JS)

[mappu]

I spent some time today trying to get ion working on port 443, but always it would make a websocket request on port 8443.

I tracked it down to the minified ion-conference.js, in the unminified src/Client.js, that sets this unconditionally:

        this._port = 8443;

that's used by _getProtooUrl.

[moqmar]

So, I solved this (together with #72) by using the following Caddyfile:

{$WWW_URL} {
  tls {$ADMIN_EMAIL}
  root /app/demo/dist
  proxy /ws biz:8443 {
    transparent
    websocket
    header_upstream Sec-WebSocket-Protocol {>Sec-WebSocket-Protocol}
  }
}

Then, you just need to set this._port to 443, either in src/Client.js when building manually or by just running 'sed -i s/8443/443/g web/ion-conference.js' on the minified version (untested). I guess the port can also just be taken from the current location instead of setting it manually in the client then...

[moqmar]

Well, the Caddyfile requires WWW_URL to include a port (example.org:80) or a scheme (http://example.org), otherwise the default port will be 2015...