Edge does not play video if server returns 304

Question

I've found that Edge doesn't work when playing videos for the 2nd time. My app is using a default <video> tag and Edge is sending an If-Modified-Since header when it loads the video for the second time. If my server returns a 304 Not-Modified it doesn't work. When I change it to return the complete video it works.

Anyone that can verify this behavior? Am I doing something wrong, should I add other things in my 304 response in order to make it work?

Btw I saw that other browsers like Chrome and Firefox never send the If-Modified-Since when loading the video.

Answer 1

You may take a look on this stackexchange question, where you can read:

According to this article, these are the situations browsers will request using If-Modified-Since:

• The cached entry has no expiration date and the content is being accessed for the first time in a browser session
• The cached entry has an expiration date but it has expired
• The user has requested a page update by clicking the Refresh button or pressing F5

[...]

One thing that may help is adding "public" to the cache control header, i.e. Cache-Control: public, max-age=31536000.

You may also add immutable, so could you try with:

Cache-Control: public, max-age=31536000, immutable