1. The problem I’m having: I want to use fail2ban. Some of my apps behind Caddy are not logging the x-forwarded-for header so it’s simply impossible to ban anyone. That’s why I want to log access with Caddy. But I only want to log 4xx 5xx response codes I’m trying to figure that out for like 3hours…

Only log specific responses

timelordx (timelordx) August 31, 2025, 5:05am 2

How to separate 4xx/5xx error logs into a different file? Help

I think you’re almost there. This might be possible to do more efficiently, but here’s a quick example I just put together. Feel free to adjust it to your needs: :80 { log log4xx5xx { output file /tmp/caddy-error4xx5xx.log { mode 664 } no_hostname } intercept { @4xx-5xx status 4xx 5xx handle_response @4xx-5xx { log_name log4xx5xx } } respond /4xx 403 respond /5xx 503 respond 200 } If you want to have separate log files for 4xx and 5xx errors, you can repeat the …

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