Update app.py

app.py

@@ -5,17 +5,17 @@ import os
 import urllib
 import base64
 
-
 def download_file(url, local_filename):
-    try:
-        with requests.get(url, stream=True) as r:
-            r.raise_for_status()
-            with open(local_filename, 'wb') as f:
-                for chunk in r.iter_content(chunk_size=8192): 
-                    f.write(chunk)
-        return local_filename
-    except requests.exceptions.HTTPError as err:
-        print(f"HTTP error occurred: {err}")  # or use logging
+    if url.startswith('http://') or url.startswith('https://'):  # add this line
+        try:
+            with requests.get(url, stream=True) as r:
+                r.raise_for_status()
+                with open(local_filename, 'wb') as f:
+                    for chunk in r.iter_content(chunk_size=8192): 
+                        f.write(chunk)
+            return local_filename
+        except requests.exceptions.HTTPError as err:
+            print(f"HTTP error occurred: {err}")  # or use logging
 
 
 def download_html_and_files(url):