Error handling and little update

app.py

@@ -1,21 +1,29 @@
 import gradio as gr
 import requests
 import os
+import re
 
 def download_file(url):
   """Downloads a file from a URL and returns the local file path."""
+  if not url.startswith("http://") and not url.startswith("https://"):
+    url = "http://" + url  # Prepend "http://" if not present
+
   try:
     response = requests.get(url, stream=True)
     response.raise_for_status()  # Raise an exception for bad status codes
 
-    # Generate a unique temporary filename
-    temp_filename = os.path.basename(url) 
+    # Generate a safe and unique temporary filename
+    original_filename = os.path.basename(url)
+    # Remove invalid characters from filename
+    safe_filename = re.sub(r'[^\w\-_\. ]', '_', original_filename) 
+    temp_filename = f"{safe_filename}"
+
     with open(temp_filename, 'wb') as f:
-      for chunk in response.iter_content(chunk_size=8192):
+      for chunk in response.iter_content(chunk_size=8192000):
         f.write(chunk)
     return temp_filename
   except requests.exceptions.MissingSchema:
-    return "Error: Invalid URL format. Please include the protocol (e.g., http:// or https://)."
+    return "Error: Invalid URL format. Even after adding 'http://', the URL is still invalid."
   except requests.exceptions.ConnectionError:
     return "Error: Could not connect to the server. Please check your internet connection."
   except requests.exceptions.RequestException as e: