diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index f2ab1a52..625ee039 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -155,6 +155,21 @@ http {
 
         # Web Api
         location / {
+            # Handle preflight OPTIONS requests
+            if ($request_method = OPTIONS ) {
+                # Add CORS headers for preflight request
+                add_header 'Access-Control-Allow-Origin' "$http_origin" always;
+                add_header 'Access-Control-Allow-Credentials' 'true' always;
+                add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
+                add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type' always;
+                add_header 'Access-Control-Max-Age' 1728000;
+                return 204;
+            }
+
+            add_header 'Access-Control-Allow-Origin' "$http_origin" always;
+            add_header 'Access-Control-Allow_Credentials' 'true' always;
+            add_header 'Access-Control-Allow-Headers' 'Authorization, Content-Type' always;
+            
             proxy_pass http://MIH-AI:11434/;
         }