Update app.py

app.py

@@ -20,7 +20,14 @@ import logging
 logging.basicConfig(level=logging.INFO)
 
 def download_pdf(url, output_path):
-    urllib.request.urlretrieve(url, output_path)
+    try:
+        urllib.request.urlretrieve(url, output_path)
+    except urllib.error.HTTPError as e:
+        if e.code == 429:
+            time.sleep(1)  # Wait for 1 second before retrying
+            download_pdf(url, output_path)
+        else:
+            raise
 
 def preprocess(text):
     text = text.replace('\n', ' ')