jdksdksajdjs2

g

nginx.conf

@@ -1,35 +1,49 @@
 events {}
 
 http {
+    # Docker's built-in DNS. With the upstreams below held in variables,
+    # nginx re-resolves the service names at request time instead of caching
+    # the address from startup — so a recreated container (new IP) does not
+    # leave nginx proxying to a stale address (502).
+    resolver 127.0.0.11 valid=10s ipv6=off;
+
+    # "Connection: upgrade" only for real upgrade requests, not every one.
+    map $http_upgrade $connection_upgrade {
+        default upgrade;
+        ''      close;
+    }
+
     server {
         listen 80;
         server_name _;
 
         # Api Requests
         location /api/ {
-            proxy_pass http://backend:5000;
-            
+            set $api_upstream http://backend:5000;
+            proxy_pass $api_upstream;
+
             proxy_http_version 1.1;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
             proxy_set_header Upgrade $http_upgrade;
-            proxy_set_header Connection "upgrade";
+            proxy_set_header Connection $connection_upgrade;
         }
 
         # Normal requests
         location / {
-            proxy_pass http://frontend:3000;
-            
+            set $frontend_upstream http://frontend:3000;
+            proxy_pass $frontend_upstream;
+
             proxy_http_version 1.1;
             proxy_set_header Host $host;
             proxy_set_header X-Real-IP $remote_addr;
             proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             proxy_set_header X-Forwarded-Proto $scheme;
             proxy_set_header Upgrade $http_upgrade;
-            proxy_set_header Connection "upgrade";
+            proxy_set_header Connection $connection_upgrade;
         }
-        
+
     }
 }