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-o4

Permission defined... 403

bochet

For those who don't want to copy to the browser, link

The reason why the latter url can be seen is that this CDN doesn't support access control, but such a restriction can be added (as I remember from the course).

jedi

This type of "security" is called capability-based security where the assumption is Prof. Kayvon's friends could easily share his photo to the world through other means, so adding access control to the CDN is needlessly expensive.