server {
      listen 80;
      listen [::]:80;

      server_name code-containers.localhost;

      location / {
            proxy_pass http://127.0.0.1:3000;
      }
}

server {
      listen 80;
      listen [::]:80;

      server_name "~^(port-(?<port>.*)\.)?(?<container>.*)\.code-containers.localhost";

      location / {
            if ($port = "") {
                  set $port "80";
            }

            set $ip '';
            rewrite_by_lua_block {
                  local shell = require("resty.shell")

                  local ok, stdout, strerr, reason, status = shell.run("curl http://127.0.0.1:3000/containers/" .. ngx.var.container .. "/ip")
                  ngx.var.ip = stdout
            }

            proxy_pass http://$ip:$port;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
      }
}