Update app.py

app.py

@@ -88,7 +88,8 @@ def proxy(path):
         target_path = target_path[1:]
 
     # For the root path, display the custom warning page.
-    if not target_path:
+    # Handle both '' (for a request to '/') and '?' (for a request to '/?').
+    if not target_path or target_path == '?':
         return INDEX_PAGE_HTML, 200
 
     # Prepend 'https://' if the scheme is missing.
@@ -140,4 +141,4 @@ def proxy(path):
         return "An error occurred while proxying the request.", 502
 
 if __name__ == '__main__':
-    app.run(host='0.0.0.0', port=7860)
+    app.run(host='0.0.0.0', port=7860)