test https://$host

nginx/default.conf

@@ -49,7 +49,7 @@ server {
     
     if ($prerender = 1) {
       # For use of proxy_pass within a regular expression location, cf. https://stackoverflow.com/a/53354944
-      proxy_pass http://res-client-service.ns-res-$NAMESPACE_ENV-syn.svc.cluster.local:8080/api/render/$uri;
+      proxy_pass https://$host/api/render/$uri;
     }
 
     # if no prerender, apply default angular route