: For a quick user-side fix, clearing browser cache and cookies usually forces the server to send a fresh 200 OK response instead of the 304.
Mobile browsers, especially Safari on iOS , sometimes struggle to "talk" to the disk cache when it comes to large media files like MP4s. The player expects a fresh stream, the server says "no need," and the result is a broken play button or a "Source Not Found" error. How to fix it: 304 mp4
: If you use a CDN like Cloudflare , add a Page Rule to Bypass Cache specifically for .mp4 extensions. : For a quick user-side fix, clearing browser