"Drops the Linux build to focus supporting proton" makes as much sense as "drops the windows build to focus supporting direct x in wine"
Rule of acquisition #477: there is always money in the banana stand
Caddy supports it too: https://caddyserver.com/docs/caddyfile/directives/reverse_proxy
"Drops the Linux build to focus supporting proton" makes as much sense as "drops the windows build to focus supporting direct x in wine"