Module websocket 

WebSocket upgrade detection and bidirectional proxying.

When a client sends a WebSocket upgrade request (Connection: Upgrade + Upgrade: websocket), this module forwards the upgrade to the upstream backend and then establishes a bidirectional byte-copy between the client and upstream, effectively tunnelling the WebSocket frames without interpreting them.

Functions

is_websocket_upgrade

Check whether an incoming request is a WebSocket upgrade.

proxy_websocket

Proxy a WebSocket upgrade request to the given upstream address.