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net/http: make Server Handler's Request.Context be done on conn errors
This CL changes how the http1 Server reads from the client. The goal of this change is to make the Request.Context given to Server Handlers become done when the TCP connection dies (has seen any read or write error). I didn't finish that for Go 1.7 when Context was added to http package. We can't notice the peer disconnect unless we're blocked in a Read call, though, and previously we were only doing read calls as needed, when reading the body or the next request. One exception to that was the old pre-context CloseNotifier mechanism. The implementation of CloseNotifier has always been tricky. The past few releases have contained the complexity and moved the reading-from-TCP-conn logic into the "connReader" type. This CL extends connReader to make sure that it's always blocked in a Read call, at least once the request body has been fully consumed. In the process, this deletes all the old CloseNotify code and unifies it with the context cancelation code. The two notification mechanisms are nearly identical, except the CloseNotify path always notifies on the arrival of pipelined HTTP/1 requests. We might want to change that in a subsequent commit. I left a TODO for that. For now there's no change in behavior except that the context now cancels as it was supposed to. As a bonus that fell out for free, a Handler can now use CloseNotifier and Hijack together in the same request now. Fixes #15224 (make http1 Server always in a Read, like http2) Fixes #15927 (cancel context when underlying connection closes) Updates #9763 (CloseNotifier + Hijack) Change-Id: I972cf6ecbab7f1230efe8cc971e89f8e6e56196b Reviewed-on: https://go-review.googlesource.com/31173 Run-TryBot: Brad Fitzpatrick <firstname.lastname@example.org> TryBot-Result: Gobot Gobot <email@example.com> Reviewed-by: Ian Lance Taylor <firstname.lastname@example.org>
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