https://run.dlang.io/gist/d688bbcfb74c5f9106bf4c1a4f7d19a4 is just fine but https://run.dlang.io/gist/d688bbcfb74c5f9106bf4c1a4f7d19a4/ redirects to the 8080 port. This seems to be the internal port for the D application.
Also, consider not exposing this port. Passing it to the reverse proxy is desirable to apply proxy rate limits.
https://run.dlang.io/gist/d688bbcfb74c5f9106bf4c1a4f7d19a4
is just fine buthttps://run.dlang.io/gist/d688bbcfb74c5f9106bf4c1a4f7d19a4/
redirects to the8080
port. This seems to be the internal port for the D application.Also, consider not exposing this port. Passing it to the reverse proxy is desirable to apply proxy rate limits.