Class which provides handler for supporting forced socket disconnection
according to specification below.
Forced socket disconnection
A Socket.IO server must provide an endpoint to force the disconnection of the
socket.
While closing the transport connection is enough to trigger a disconnection,
it sometimes is desirable to make sure no timeouts are activated and the
disconnection events fire immediately.
http://example.com/socket.io/1/xhr-polling/812738127387123?disconnect
The server must respond with 200 OK, or 500 if a problem is detected.