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CloseNotify returns a channel that receives at most a single value (true) when the client connection has gone away.

CloseNotify may wait to notify until Request.Body has been fully read.

After the Handler has returned, there is no guarantee that the channel receives a value.

If the protocol is HTTP/1.1 and CloseNotify is called while processing an idempotent request (such a GET) while HTTP/1.1 pipelining is in use, the arrival of a subsequent pipelined request may cause a value to be sent on the returned channel. In practice HTTP/1.1 pipelining is not enabled in browsers and not seen often in the wild. If this is a problem, use HTTP/2 or only use CloseNotify on methods such as POST.