Error when with websockets

[rmaalouf]

Getting the following error when the backend uses websockets.

"ERR failed to transfer backend response body: http: request method or response status code does not allow body"

Dev console shows "WebSocket connection to 'wss://xyz/ws' failed"

Are websockets not supported or is it a configuration issue?

Thanks

[itzg]

Websockets are not explicitly supported, so this will require some kind of enhancement. A PR would be great since I don't have much time to work on this project.