Why does Browser still sends request for cache-control public with max-age?

Question

I have Amazon S3 objects, and for each object, I have set

Cache-Control: public, max-age=3600000

That is roughly 41 days.

And I hav

Answer 1

If Chrome Developer Tools are open (F12), Chrome usually disables caching.

It is controllable in the Developer Tools settings - the Gear icon to the right of the dev-tools top bar.