Websockets

The following writeup is the story of a fairly exhausting search for a bug in Mybring, that we encountered because we thought that the now 7 year old websocket standard would be safe to use. It’s a fairly comprehensive writeup that covers a few hectic days in January where we got familiar with the RFC, how the http-websocket upgrade handshake works, driving to a customer in order to debug the problem on-site with wireshark and lots of trial and error.