import socket, base64, os
def test(port):
    try:
        s=socket.create_connection(('127.0.0.1',port),timeout=6)
        key=base64.b64encode(os.urandom(16)).decode()
        req=("GET / HTTP/1.1\r\nHost: localhost\r\nUpgrade: websocket\r\nConnection: Upgrade\r\n"
             "Sec-WebSocket-Key: %s\r\nSec-WebSocket-Version: 13\r\nSec-WebSocket-Protocol: binary\r\n\r\n")%key
        s.sendall(req.encode())
        resp=s.recv(200); s.close()
        return resp.split(b"\r\n")[0].decode(errors="replace")
    except Exception as e: return "ERR %s"%(repr(e)[:80])
for n,p in ((1,6911),(2,6912),(3,6913)):
    print("dev%d port%d -> %s"%(n,p,test(p)))