Change Details

**Steps to replicate the issue** (include links if applicable): * Take an m3u8 file like: https://upload.wikimedia.org/wikipedia/commons/transcoded/1/10/Bombay_Cat_kitten_video_of_Blue_Sinfonie.ogv/Bombay_Cat_kitten_video_of_Blue_Sinfonie.ogv.m3u8 * Inspect the request * **What happens?**: Response header content-type reports `text/plain` **What should have happened instead?**: content-type should be `application/x-mpegURL` **Software version** (skip for WMF-hosted wikis like Wikipedia): **Other information** (browser name/version, screenshots, etc.): Content-type should be passed along when storing the file in swift and previously stored files need to update their mime type. A previous case where we had to fix this is: T184871

**Steps to replicate the issue** (include links if applicable): * Take an m3u8 file like: https://upload.wikimedia.org/wikipedia/commons/transcoded/1/10/Bombay_Cat_kitten_video_of_Blue_Sinfonie.ogv/Bombay_Cat_kitten_video_of_Blue_Sinfonie.ogv.m3u8 * Inspect the request * **What happens?**: Response header content-type reports `text/plain` **What should have happened instead?**: content-type should be `application/x-mpegURL` or perhaps `application/x-mpegURL; charset=utf-8` ? **Software version** (skip for WMF-hosted wikis like Wikipedia): **Other information** (browser name/version, screenshots, etc.): Content-type should be passed along when storing the file in swift and previously stored files need to update their mime type. A previous case where we had to fix this is: T184871

**Steps to replicate the issue** (include links if applicable): * Take an m3u8 file like: https://upload.wikimedia.org/wikipedia/commons/transcoded/1/10/Bombay_Cat_kitten_video_of_Blue_Sinfonie.ogv/Bombay_Cat_kitten_video_of_Blue_Sinfonie.ogv.m3u8 * Inspect the request * **What happens?**: Response header content-type reports `text/plain` **What should have happened instead?**: content-type should be `application/x-mpegURL` or perhaps `application/x-mpegURL; charset=utf-8` ? **Software version** (skip for WMF-hosted wikis like Wikipedia): **Other information** (browser name/version, screenshots, etc.): Content-type should be passed along when storing the file in swift and previously stored files need to update their mime type. A previous case where we had to fix this is: T184871