CONSOLE ERROR: line 58: Mixed Content: The page at 'https://web-platform.test:8444/mixed-content/xhr-request/http-csp/same-host-http/top-level/no-redirect/blockable/opt-in-blocks.https.html' was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint 'http://web-platform.test:8001/mixed-content/generic/expect.py?redirection=no-redirect&action=purge&key=ff2029f4-34a5-4c22-b37a-4be4a5ba2cfd&path=%2Fmixed-content&content_type=application/json'. This request has been blocked; the content must be served over HTTPS.
