net/http: fix race between dialing and canceling
In the brief window between getConn and persistConn.roundTrip, a cancel could end up going missing. Fix by making it possible to inspect if a cancel function was cleared and checking if we were canceled before entering roundTrip. Fixes #10511 Change-Id: If6513e63fbc2edb703e36d6356ccc95a1dc33144 Reviewed-on: https://go-review.googlesource.com/9181Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org>
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