CONSOLE ERROR: line 387: Mixed Content: The page at 'https://web-platform.test:8444/mixed-content/websocket-request/no-opt-in/cross-origin-ws/top-level/swap-scheme-redirect/blockable/ws-downgrade-blocks.https.html' was loaded over HTTPS, but attempted to connect to the insecure WebSocket endpoint 'ws://www1.web-platform.test:9001/stash_responder?redirection=swap-scheme-redirect&action=purge&key=c1754e6f-8cb8-443c-a5f8-7882a3d98abb&path=%2Fmixed-content&content_type=application/json'. This request has been blocked; this endpoint must be available over WSS.
