[mbeijen]

This adds test/modules/http3, a pyhttpd suite that sends requests over HTTP/3 with curl --http3-only to the QUIC listener on the https port number. It covers static files, HEAD, 404, a 1 MB response, several requests on one connection, vhost selection by Host, and CGI with POST bodies up to 1 MB.

It skips when mod_http3, mod_ssl or an HTTP/3-capable curl is missing, so it won't run in CI until a later PR adds a job for it.

• This PR does not report or address a security vulnerability (see SECURITY.md and https://www.apache.org/security/#reporting-a-vulnerability).
• Code follows the httpd style guide.
• New log messages (level debug or higher) use an empty APLOGNO() tag; numbers are assigned by a committer at merge time (see docs/log-message-tags/README).
• If the change is user-visible, a changes-entries/*.txt file is included, following the template in README.CHANGES (not needed otherwise).
• Test cases based on pyhttpd are included where appropriate, in the test/modules/xxx directory matching the modules/xxx module source, or test/modules/core for core server changes. On Unix, verify these pass locally with e.g. make check-pytest PYTEST_DIRS=test/modules/xxx.

[jfclere]

it gives:
+++
modules/http3/test_001_get.py::TestGet::test_h3_001_01
modules/http3/test_002_cgi.py::TestCgi::test_h3_002_01
/home/jfclere/TMP/httpd-asf/test/.venv/lib64/python3.14/site-packages/_pytest/fixtures.py:1392: PytestRemovedIn10Warning: Class-scoped fixtures defined as instance methods are deprecated.
Instance attributes set in the '_class_scope' fixture will NOT be visible to test methods,
as each test gets a new instance while the fixture runs only once per class.
Use a @classmethod decorator below @pytest.fixture and set attributes on cls instead.
See https://docs.pytest.org/en/stable/deprecations.html#class-scoped-fixture-as-instance-method
fixturefunc = resolve_fixture_function(fixturedef, request)
+++
The fix is easy and that is just a warning.