this patch: 62e546c
removed the "Hijack" method, which is required to be able to escalate http 1.1 connection to websocket.
after upgrading, we now get: "websocket: response does not implement http.Hijacker", some googling relevant links:
https://stackoverflow.com/questions/62980183/response-does-not-implement-http-hijacker
we are downgrading for now.