CONSOLE ERROR: Mixed Content: The page at 'https://web-platform.test:8444/mixed-content/audio-tag/http-csp/cross-origin-http/top-level/no-redirect/optionally-blockable/opt-in-blocks.https.html' was loaded over HTTPS, but requested an insecure audio file 'http://www1.web-platform.test:8001/mixed-content/generic/expect.py?redirection=no-redirect&action=purge&key=fbca27f8-01b9-4f88-a40d-1d03304c83c7&path=%2Fmixed-content&content_type=audio/wav'. This request has been blocked; the content must be served over HTTPS.
