caddy-ja3

A caddy plugin to get JA3 fingerprints from requests as a header.

Building with xcaddy

xcaddy build \
  --with github.com/fidraC/caddy-ja3

Sample Caddyfile

Note that this enforces HTTPS (TLS).
You can add a http_redirect to automatically redirect http -> https like shown below.

{
  order ja3 before respond # change this to whatever idk
  servers {
     listener_wrappers {
       http_redirect
       ja3
       tls
     }
  }
}

localhost:2020 {
  ja3
  tls internal                     # Configure your tls however you want
  respond "Your JA3: {header.ja3}" # JA3 is added to the request as a header ("ja3")
}

Disclaimer

I am not guaranteeing you 100% uptime
This should work but feel free to file an issue