There are no cache instructions on mp4s on the CDN, could you please add some on?
curl -I https://s.w.org/images/core/4.6/streamlined-updates.mp4 HTTP/1.1 200 OK Accept-Ranges: bytes Content-Type: video/mp4 Date: Tue, 16 Aug 2016 13:13:27 GMT Last-Modified: Tue, 16 Aug 2016 12:58:26 GMT Server: nginx X-Frame-Options: SAMEORIGIN X-nc: MISS lax 186 Content-Length: 225101
Looks like webm has them:
curl -I https://s.w.org/images/core/4.6/streamlined-updates.webm HTTP/1.1 200 OK Accept-Ranges: bytes Cache-Control: max-age=315360000 Content-Type: video/webm Date: Tue, 16 Aug 2016 13:14:11 GMT Expires: Thu, 31 Dec 2037 23:55:55 GMT Last-Modified: Tue, 16 Aug 2016 12:58:26 GMT Server: nginx X-Frame-Options: SAMEORIGIN X-nc: HIT lax 186 Content-Length: 449672
For 4.6 we don’t use ogv but 4.3 had one:
curl -I https://s.w.org/images/core/4.3/formatting.ogv HTTP/1.1 200 OK Accept-Ranges: bytes Content-Type: application/octet-stream Date: Tue, 16 Aug 2016 13:09:55 GMT Last-Modified: Wed, 29 Jul 2015 16:49:59 GMT Server: nginx X-Frame-Options: SAMEORIGIN X-nc: MISS lax 186 Content-Length: 1939540
The content type should probably be video/ogg.