diff --git a/nginx/default.conf b/nginx/default.conf
index 48351cd4b260c97c5e176e5b35e1502ca0eb6690..050a0543a732d8f0aa904f97f36afa373368afaf 100644
--- a/nginx/default.conf
+++ b/nginx/default.conf
@@ -38,18 +38,21 @@ server {
   #allow 80.14.51.82;      # Erasme
   #deny all;
 
-  # prerender news post for linkedin
-  location ~ ^/actualites/details/(.*)$ {
+  # Prerender news post for linkedin
+  # use regular expression for location to avoid nginx resolve error (https://stackoverflow.com/questions/57937222/502-bad-gateway-nginx-no-resolver-defined-to-resolve ) # 
+  location ^~ /actualites/details/ {
+
     resolver  dns-default.openshift-dns.svc.cluster.local;
+
+    # proxy_set_header must be outside if clause (cf. https://stackoverflow.com/questions/16500594/why-i-cant-put-proxy-set-header-inside-an-if-clause )
+    proxy_set_header User-Agent "";
+    
     if ($prerender = 1) {
       # For use of proxy_pass within a regular expression location, cf. https://stackoverflow.com/a/53354944
-      
-      # tester :
-      #proxy_pass http://res-client-service.cluster.local:8080/api/render/$1; 
-
-      proxy_pass http://res-client-service.ns-res-d01-syn.svc.cluster.local:8080/api/render/$1;
+      proxy_pass http://res-client-service.ns-res-d01-syn.svc.cluster.local:8080/api/render/$uri;
     }
 
+    # if no prerender, apply default angular route
     try_files $uri $uri/ /index.html;
   }
   
diff --git a/nginx/local.conf b/nginx/local.conf
index 0047fe059e3eba7a17ed8450d5fb4a86b199083c..ccda2d7bb390c5516e45ec762b8f73a6a27adb25 100644
--- a/nginx/local.conf
+++ b/nginx/local.conf
@@ -24,13 +24,19 @@ server {
 
   root /usr/share/nginx/html/;
 
-  # prerender news post for linkedin
-  location ~ ^/actualites/details/(.*)$ {
+  # Prerender news post for linkedin
+  # use regular expression for location to avoid nginx resolve error (https://stackoverflow.com/questions/57937222/502-bad-gateway-nginx-no-resolver-defined-to-resolve ) # 
+  location ^~ /actualites/details/ {
+
+    # proxy_set_header must be outside if clause (cf. https://stackoverflow.com/questions/16500594/why-i-cant-put-proxy-set-header-inside-an-if-clause )
+    proxy_set_header User-Agent "";
+    
     if ($prerender = 1) {
       # For use of proxy_pass within a regular expression location, cf. https://stackoverflow.com/a/53354944
-      proxy_pass http://172.17.0.1:8030/api/render/$1;
+      proxy_pass http://172.17.0.1:8030/api/render/$uri;
     }
 
+    # if no prerender, apply default angular route
     try_files $uri $uri/ /index.html;
   }