Update nginx.conf

nginx.conf

@@ -93,7 +93,7 @@ http {
                 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
             }
 
-            error_page 502 = /codeserver/;
+            error_page 502 = /codeserver/?folder=/home/user/app;
             location / {
                 proxy_pass http://127.0.0.1:7860;
                 proxy_http_version 1.1;