use nginx variable to prevent crashing if upstream is down

Author: sidpalas

05-example-web-application/client-react/nginx.conf

@@ -1,25 +1,31 @@
 server {
   listen 80;
+  
+  # Docker internal dns server
+  resolver 127.0.0.11;
+  
   location /ping {
         access_log off;
         add_header 'Content-Type' 'text/plain';
         return 200 "pong";
   }
   location /api/golang/ {
-        resolver 127.0.0.1;
         proxy_set_header X-Forwarded-Host $host;
         proxy_set_header X-Forwarded-Server $host;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_http_version 1.1;
-        proxy_pass http://api-golang:8080/;
+
+        set $api_golang_upstream http://api-golang:8080/;
+        proxy_pass $api_golang_upstream;
   }
   location /api/node/ {
-        resolver 127.0.0.1;
         proxy_set_header X-Forwarded-Host $host;
         proxy_set_header X-Forwarded-Server $host;
         proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
         proxy_http_version 1.1;
-        proxy_pass http://api-node:3000/;
+
+        set $api_node_upstream http://api-node:3000/;
+        proxy_pass $api_node_upstream;
   }
   location / {
     root /usr/share/nginx/html;