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act-rules / act-rules.github.io

Accessibility conformance testing rules for HTML
https://act-rules.github.io/
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Wrong MIME type for rabbit-video/video.mp4 #2053

Closed dd8 closed 1 year ago

dd8 commented 1 year ago

The MIME type for https://www.w3.org/WAI/content-assets/wcag-act-rules/test-assets/rabbit-video/video.mp4 used to be video/mp4

The MIME type is now application/mp4 - which indicates the MP4 contains no video or audio according to RFC 4337

This no longer matches the applicability of the rule because it's not an audio or video MIME type: https://act-rules.github.io/rules/8fc3b6#applicability

That means failed example 2 no longer fails because it uses the rabbit video: https://act-rules.github.io/rules/8fc3b6#failed-example-2

Here are the headers from Chrome DevTools

General Request URL: https://www.w3.org/WAI/content-assets/wcag-act-rules/test-assets/rabbit-video/video.mp4 Request Method: GET Status Code: 200 Remote Address: 104.18.22.19:443 Referrer Policy: strict-origin-when-cross-origin

Response Headers accept-ranges: bytes access-control-allow-origin: * alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400 cache-control: max-age=600 cf-cache-status: BYPASS cf-ray: 7ba369df9a5f0764-MAN content-length: 1053651 content-security-policy: upgrade-insecure-requests content-type: application/mp4 date: Wed, 19 Apr 2023 07:25:26 GMT etag: "643e940c-1013d3" expires: Wed, 19 Apr 2023 07:35:16 GMT last-modified: Tue, 18 Apr 2023 12:58:52 GMT permissions-policy: interest-cohort=() server: cloudflare strict-transport-security: max-age=15552000; includeSubdomains; preload vary: Accept-Encoding via: 1.1 varnish x-backend: www-mirrors x-cache: HIT x-cache-hits: 1 x-fastly-request-id: c680f5cc124891ad4e90df37dd6c20683b982967 x-github-request-id: CAAE:82BE:126E82A:1A5B344:643F975C x-origin-cache: HIT x-proxy-cache: MISS x-request-id: 7ba369df9a5f0764 x-served-by: cache-lga21920-LGA x-timer: S1681889127.773894,VS0,VE2

WilcoFiers commented 1 year ago

@dd8 Assigned to Daniel. This is a W3C server question, so not something we can control directly. We'll try to get it fixed though.

daniel-montalvo commented 1 year ago

Our Systems team is investigating this at the moment. GitHub pages and CloudFlare may be involved in this behavior as well. I'll update this issue when there is updates to that.

gosko commented 1 year ago

This seems to be a bug in GitHub Pages. I started a discussion on the GitHub community site to see if anyone has an idea about this, and hopefully get someone's attention at GitHub. If that doesn't accomplish anything I will try to contact GitHub support. I think this behavior likely changed due to this recent update to the mime-db project, on Feb 5.

gosko commented 1 year ago

This issue with GitHub Pages has now been fixed.

daniel-montalvo commented 1 year ago

Just tried it now and content-type is now video/mp4.

Closing. Thanks @gosko for your involvement in this.