Now my turn to admit I’ve never used Caddy. What do you love about it?

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The configuration is dead simple, built in letsencrypt and SSL upgrade management, and I've got three docker instances behind it as a reverse proxy and it's only consuming ~40 MB of RAM.

Oh, and it's written in Go, so no dependencies so launching it in docker is a stupid small image.

can it discover the docker instances like traefik does?

If by discover you mean can you use the container name for the redirect, yes. I've never used traefik so I'm not 💯 that's what you meant though.

ah ok but you‘d still have to know the name, got it. yeah caddy is cool..

with traefik you can use some kind of config discovery backend like consul etc..