net/http: Test304Responses failures

[gopherbot]

#!watchflakes
default <- pkg == "net/http" && test == "Test304Responses"

Issue created automatically to collect these failures.

Example (log):

=== RUN   Test304Responses
=== PAUSE Test304Responses

— watchflakes

[gopherbot]

Found new dashboard test flakes for:

#!watchflakes
default <- pkg == "net/http" && test == "Test304Responses"

2025-08-08 02:04 gotip-darwin-amd64-race go@73ff6d14 net/http.Test304Responses [SKIP] (log)

=== RUN   Test304Responses
=== PAUSE Test304Responses

— watchflakes