MP4 is downloading instead of playing

Question

MP4 files are sometimes downloaded, and other times they play in the browser.

What is the difference between these two links?

1) If you open this URL in Chr

Answer 1

First link has Content-Type: application/octet-stream header, while the second one Content-Type: video/mp4.

Answer 2

With Serg's answer , I would also like to add about Content-Disposition header . If you set the Content-Disposition as inline , then your video/content will play within the browser and if you set Content-Disposition as attachment , then your browser will download it .

More info on this can be found here .