WebSocket is bullshit.
Here is the alternative
> HEAD eid1
200 FOUND
Content-length: 1234
> HEAD eid2
302 FOUND
Location: https://relay2.com/eid2
> HEAD eid3
302 FOUND
Location: https://relay3.com/eid3
> HEAD eid4
200 FOUND
Content-length: 1234
> HEAD eid5
200 FOUND
Content-length: 1234