In Apache 2.4 you can reverse proxy an HTTP connection to a local Unix socket with: [1]
ProxyPass unix:/path/to/app.sock|http://example.com/app/name
You can reverse proxy a WebSocket connection to a local TCP socket with: [2]
ProxyPass ws://127.0.0.1:12345/app/name
But how can you reverse proxy a WebSocket connection to a Unix socket? [☹]