How to load static resources from an external folder

I want to use some pictures from a folder that is not part of the final war/jar.
Right now I have them inside my resources folder and I fetch them using the url frontend/special-images/special_1.png.

As there will be images added over time (no redeploy!), I want to externalize them to a local folder for now.

How would I make those available again for the vaadin application? (also it should not restrict the caching done by the browser).
I use Spring Boot by the way.

Thank you already!

Solved it myself by simply adding a custom servlet :slight_smile: