it's also very tricky to do given the current architecture on the server side where one single-threaded process handles the connection and uses (for all intents

it's also very tricky to do given the current architecture on the server side where one single-threaded process handles the connection and uses (for all intents and purposes) sync io. In such a scenario, listening (and acting) on cancellation requests on the same connection becomes very hard, so fixing this goes way beyond "just".