How to set custom http header when the cache hit?

[BennyThink]

Hi, I wonder if I can set a customer header to inform the client that the cache has been hit. Is this even possible? I didn't find any resolutions through documents and issues. I'll be grateful if there are some workarounds.

Thanks!

[johnjeffers]

I'd like to know how to do this as well. I looked thru the docs and examples, and the linked PR, but I don't see anything that explains how to do it.

[BennyThink]

Maybe use fork mentioned in above PR.