Add documentation for websockify

docs/source/server-process.md

@@ -153,6 +153,18 @@ One of:
 
 (server-process:callable-arguments)=
 
+### `websockify`
+
+_True_ to proxy only websocket connections into raw stream connections.
+_False_ (default) if the proxied server speaks full HTTP.
+
+If _True_, the proxied server is treated a raw TCP (or unix socket) server that
+does not use HTTP.
+In this mode, only websockets are handled, and messages are sent to the backend
+server as stream data. This is equivalent to running a
+[websockify](https://github.com/novnc/websockify) wrapper.
+All other HTTP requests return 405.
+
 #### Callable arguments
 
 Any time you specify a callable in the config, it can ask for any arguments it needs