Change back to /upload

nginx.conf

@@ -22,7 +22,7 @@ http {
       access_log off;
     }
 
-    location ~* ^/ {
+    location ~* ^/upload {
       if ($request_method = 'OPTIONS') {
         # Tell client that this pre-flight info is valid for 20 days
         add_header 'Access-Control-Allow-Origin' "*" ;