x/net/http2: TestLegacy failures

[gopherbot]

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

Issue created automatically to collect these failures.

Example (log):

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_enough_frame_size_to_start_reading (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	26.596s
        FAIL
--- FAIL: TestLegacy (30.75s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-05-08 20:02 x_net-gotip-linux-loong64 net@b138e062 go@74c35fca x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_enough_frame_size_to_start_reading (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	26.596s
        FAIL
--- FAIL: TestLegacy (30.75s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-05-08 23:29 x_net-gotip-netbsd-arm64 net@23ee2efe go@ce4fc941 x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.01s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_default_max_frame_size (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	45.622s
        FAIL
--- FAIL: TestLegacy (57.54s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-05-22 01:12 x_net-gotip-netbsd-arm64 net@4ece7b61 go@e4283592 x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_enough_frame_size_to_start_reading (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	46.329s
        FAIL
--- FAIL: TestLegacy (58.68s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-05-29 16:46 x_net-gotip-windows-amd64 net@db078759 go@e7bccd36 x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["C:\\b\\s\\w\\ir\\x\\w\\goroot\\bin\\go.exe" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_enough_frame_size_to_start_reading (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got read tcp 127.0.0.1:63994->127.0.0.1:63992: wsarecv: An existing connection was forcibly closed by the remote host.
        671
        FAIL
        FAIL	golang.org/x/net/http2	15.591s
        FAIL
--- FAIL: TestLegacy (20.74s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-06-02 20:06 x_net-gotip-linux-ppc64le_power9 net@8ecbaa95 go@d1d68c2d x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_enough_frame_size_to_start_reading (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	44.946s
        FAIL
--- FAIL: TestLegacy (57.03s)

— watchflakes

[cherrymui]

cc @neild @tombergan @nicholashusin

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-06-09 16:58 x_net-gotip-linux-ppc64le_power10 net@9e7fdbfa go@431520e3 x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_default_max_frame_size (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	22.186s
        FAIL
--- FAIL: TestLegacy (28.56s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-07-09 00:33 x_net-go1.27-linux-ppc64le_power8 net@a3c1227e release-branch.go1.27@075e9d41 x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_default_max_frame_size (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	26.876s
        FAIL
--- FAIL: TestLegacy (34.83s)

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "golang.org/x/net/http2" && test == "TestLegacy"

2026-07-10 17:39 x_net-gotip-netbsd-arm64 net@6ae817d6 go@92efe23b x/net/http2.TestLegacy (log)

=== RUN   TestLegacy
    wrap_test.go:37: ["/home/swarming/.swarming/w/ir/x/w/goroot/bin/go" "test" "-tags=http2legacy" "golang.org/x/net/http2"] failed: exit status 1
        --- FAIL: TestTransportFailureErrorForHTTP1Response (0.00s)
            --- FAIL: TestTransportFailureErrorForHTTP1Response/with_enough_frame_size_to_start_reading (0.00s)
                transport_test.go:317: expected error to contain "frame header looked like an HTTP/1.1 header", got http2: client conn could not be established
        671
        FAIL
        FAIL	golang.org/x/net/http2	46.835s
        FAIL
--- FAIL: TestLegacy (58.42s)

— watchflakes