I'm a bit perplexed on debugging of caching circumstances in the landscape of Apache (webserver) and Nginx (reverse proxy):

I'm trying to get into knowledge, whether images are properly cached or not.

**Image header from devtools** looks like:

[![enter image description here](https://i.stack.imgur.com/jaRLu.png)](https://i.stack.imgur.com/jaRLu.png)

**Diagnosis by Webpagetest** looks like:

[![enter image description here](https://i.stack.imgur.com/8mL37.png)](https://i.stack.imgur.com/8mL37.png)

But **devtools shows**, like images would be cached, like this (right column):

[![enter image description here](https://i.stack.imgur.com/i7k7C.png)](https://i.stack.imgur.com/i7k7C.png)

Is it possible to say something definitely, like "yes, images are properly cached" or "no, images aren' cached"? Or "not enough data"?