WebSockets (minimal)

Dependencies:

• #40 Refactoring the proxy core for extensible protocol parsing
• #210 Actively manage number of open file descriptors
• #215 PCAP logging

Tasks:

• [ ] Implement minimal subset of WebSockets protocol needed to proxy it, with only raw binary logging (PCAP), no decoding of framing
• [ ] Implement upgrading HTTP/1.x to WebSockets
• [ ] Extend connection logging with upgrade to WebSockets, including subprotocol
• [ ] Test on different platforms and with different browsers/clients

Out of scope:

• #209 HTTP CONNECT proxy traversal for ws:// and wss://
• #217 WebSockets (full decoding)

Resources:

• https://en.wikipedia.org/wiki/WebSocket
• https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API/Writing_WebSocket_servers