that's exactly what I ended up doing. just forked it and had it pass a :key-fn in opts the same way wrap-json-response works. could submit it as a PR, but i suspect its probably opening up to many unanswered questions

@bostonaholic

I would still open up the PR, maybe the author has thought about it and why it might be a good or bad idea. If the author of ring wishes to not include your feature, then stick with your fork (Knowing that you’ll want to pull from upstream when new versions are released).