Bug report

calling http.client.HTTPConnection._tunnel() may result in a ResourceWarning because the response is not closed

this results in an intermittent failure on the urllib3 test test/with_dummyserver/test_proxy_poolmanager.py::TestHTTPProxyManager::test_tunneling_proxy_request_timeout[https-https] with ResourceWarnings enabled, see https://github.com/urllib3/urllib3/actions/runs/4638944124/jobs/8209257011#step:6:2471 and https://github.com/urllib3/urllib3/blob/4d425a2d767ce2e0c988fff4385046ea57458c49/test/with_dummyserver/test_proxy_poolmanager.py#L480-L498

Your environment

• CPython versions tested on: 3.8-3.11

Linked PRs

• GH-103472: close response in HTTPConnection._tunnel #103473
• [3.11] GH-103472: close response in HTTPConnection._tunnel (GH-103473) #104077