net/http: TestServerNoWriteTimeout failures

[gopherbot]

#!watchflakes
default <- pkg == "net/http" && test == "TestServerNoWriteTimeout"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestServerNoWriteTimeout
    testing.go:1398: race detected during execution of test
--- FAIL: TestServerNoWriteTimeout (0.36s)
    serve_test.go:910: server write response: client disconnected

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "net/http" && test == "TestServerNoWriteTimeout"

2024-03-22 16:33 gotip-linux-amd64-longtest-race go@1c864333 net/http.TestServerNoWriteTimeout (log)

=== RUN   TestServerNoWriteTimeout
    testing.go:1398: race detected during execution of test
--- FAIL: TestServerNoWriteTimeout (0.36s)
    serve_test.go:910: server write response: client disconnected

— watchflakes

[cherrymui]

Dup of #66519.