net/http: TestTransportAndServerSharedBodyRace failures with Proxy copy error

[gopherbot]

#!watchflakes
post <- pkg == "net/http" && test == "TestTransportAndServerSharedBodyRace" && `Proxy copy error:`

Issue created automatically to collect these failures.

Example (log):

Proxy copy error: EOF
--- FAIL: TestTransportAndServerSharedBodyRace (0.01s)
    --- FAIL: TestTransportAndServerSharedBodyRace/h2 (0.02s)
        serve_test.go:3969: Proxy copy error: EOF
        clientserver_test.go:210: server log: http: TLS handshake error from 127.0.0.1:51608: read tcp 127.0.0.1:36197->127.0.0.1:51608: use of closed network connection

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && test == "TestTransportAndServerSharedBodyRace"

2023-02-07 22:22 linux-amd64-clang go@9565d990 net/http.TestTransportAndServerSharedBodyRace (log)

Proxy copy error: EOF
--- FAIL: TestTransportAndServerSharedBodyRace (0.01s)
    --- FAIL: TestTransportAndServerSharedBodyRace/h2 (0.02s)
        serve_test.go:3969: Proxy copy error: EOF
        clientserver_test.go:210: server log: http: TLS handshake error from 127.0.0.1:51608: read tcp 127.0.0.1:36197->127.0.0.1:51608: use of closed network connection

— watchflakes

[bcmills]

(attn @neild)

#49336 is for the same test, but has a different (possibly unrelated?) failure mode.

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
post <- pkg == "net/http" && test == "TestTransportAndServerSharedBodyRace" && `Proxy copy error:`

2023-03-08 21:46 linux-amd64 go@4df95d51 net/http.TestTransportAndServerSharedBodyRace (log)

Proxy copy error: EOF
--- FAIL: TestTransportAndServerSharedBodyRace (0.00s)
    --- FAIL: TestTransportAndServerSharedBodyRace/h2 (0.03s)
        serve_test.go:3973: Proxy copy error: EOF

— watchflakes