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All async request processing goes through `_AsyncResource`, so this is the only place where a `Deferred` needs to be captured for cancellation. Unfortunately, the same isn't true for determining whether a request can be cancelled. Each of `RestServlet`, `BaseFederationServlet`, `DirectServe{Html,Json}Resource` and `ReplicationEndpoint` have different wrappers around the method doing the request handling and they all need to be handled separately. Signed-off-by: Sean Quah <seanq@element.io>