Add custom_50x/nginx.setup

custom_50x/nginx.setup

@@ -0,0 +1,16 @@
+  location / {
+        client_max_body_size 512M;
+        proxy_pass http://192.168.1.2:3000;
+        proxy_set_header Connection $http_connection;
+        proxy_set_header Upgrade $http_upgrade;
+        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;
+  }
+
+    error_page 500 502 503 504 /custom_50x.html;
+    location = /custom_50x.html {
+        root /usr/share/nginx/html;
+        internal;
+    }