Mastodon Caddyfile Proxy

masto.example.com {
  root /path/to/your/mastodon/public
  gzip

  rewrite {
    if {path} is /
    to /proxy/{uri}
  }

  rewrite {
    to {path} /proxy/{uri}
  }

  proxy /proxy localhost:3000 {
    except /proxy/api/v1/streaming
    without /proxy
    transparent
  }

  proxy /proxy/api/v1/streaming 127.0.0.1:4000 {
    without /proxy
    transparent
    websocket
  }
}

Assumes you're running the web and streaming servers on the same machine as caddy. The only two snippets you'll need to update to make this work are

1. Your FQDN on line 1 instead of masto.example.com
2. The path to the public directory inside your mastodon project, on line 2 after the root directive.

Note that this does work even if your firewall blocks 3000 and 4000.