Hey PlantUML Team,
I use your proxy server to show UML diagrams in GitHub markdown files and they work just great. GitHub caches the generated images using a service of their own named "Camo" though: https://help.github.com/articles/about-anonymized-image-urls/
That's a pain, given that the generated images don't get updated when I change my UML files.
I wonder if you guys could set the header "Cache-Control" to "no-cache" as a permanent solution to this issue?
(more details on the GitHub help page in the link)