This connection's number within the session: 1 for the fresh one, then one more per resume.
OptionalDriverThe driver class that minted the session.
Epoch ms at which the session ends; the relay closes the connection then.
The session's connection limit.
The session's frame policy.
true for a resume (the browser presented a forwarded handle), false for the fresh connection.
The upstream websocket URL.
OptionalUserThe MJ user the session was minted for.
What RealtimeProxyRegistry.OpenRelaySession grants one connection.