StateActive represents a connection that has read 1 or more bytes of a request. The Server.ConnState hook for StateActive fires before the request has entered a handler and doesn't fire again until the request has been handled. After the request is handled, the state transitions to StateClosed, StateHijacked, or StateIdle. For HTTP/2, StateActive fires on the transition from zero to one active request, and only transitions away once all active requests are complete. That means that ConnState cannot be used to do per-request work; ConnState only notes the overall state of the connection.