net/http: resolve data race in TestMaxBytesHandler By the time handlerN and handlerErr are read by the main goroutine, the server handler which writes to handlerN and handlerErr might still be alive in HTTP/3 due to connection closure being asynchronous. Despite the data race being logically impossible (when the main goroutine reads handlerN and handlerErr, the server handler has definitely written the response body and will no longer be writing to the contested variables), this will trip off the race detector. As such, add a mutex to appease the race detector. For #70914 Change-Id: I453fdacf9056403886a789ee37023d126a6a6964 Reviewed-on: https://go-review.googlesource.com/c/go/+/771440 Reviewed-by: Nicholas Husin <husin@google.com> LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Damien Neil <dneil@google.com>
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