virtualHosts = {
      let
        defaultProxySettings = ''
              proxy_set_header X-Real-IP $remote_addr;
              proxy_http_version 1.1;
              proxy_set_header Upgrade $http_upgrade;
              proxy_set_header Connection "upgrade";
            '';
      in {
        "example.com" = {
          enableACME = true;
          forceSSL = true;
          locations."/" = {
            proxyPass = "http://localhost:3000/";
            extraConfig = defaultProxtSettings;