Please add a path parameter to the connection page for use when running xpra behind a proxy.
r18725 should be sufficient. You can place the index.html and connect.html at any path location and that same pathname will be used for the websocket connection to the xpra server, or you can override the location with the "path" parameter which is shown under "advanced options" on the connect page.
If that works for you, we can remove the ugly path hack from wiki/Nginx
I have updated the wiki and removed the ugly hack which is no longer necessary: wiki/Nginx.
Feel free to re-open if I've missed something.
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1784