Disconnect event is not propogated to the middleware while a request is processing
Hello,
We were working on an HttpDisconnectMiddleware, which would cancel the ongoing tasks when user cancels the requests.
We were using this same middleware with other servers like uvicorn and hypercorn, which would trigger the exception upon cancellation, but in the case of granian, it seems like the disconnect event is queued and not sent to the middleware, and only sent to it after the task finishes.
I've created a repo for showcasing the effect,
https://github.com/speksen-kb01/fastapi-disconnect-example
Is there a reason why we couldn't get the event while a request is being processed? If so, what do you think it is related to and is it fixable by changing the middleware to some extent?
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