Update app.py

app.py

@@ -22,9 +22,19 @@ class Handler(http.server.SimpleHTTPRequestHandler):
         super().__init__(*args, directory=str(temp_dir), **kwargs)
 
 def start_server():
-    with socketserver.TCPServer(("", PORT), Handler) as httpd:
-        print(f"Serving at port {PORT}")
-        httpd.serve_forever()
+    global PORT  # Make sure to define PORT as global
+    while True:
+        try:
+            with socketserver.TCPServer(("", PORT), Handler) as httpd:
+                print(f"Serving at port {PORT}")
+                httpd.serve_forever()
+        except OSError as e:
+            if e.errno == 98:  # errno 98 means address already in use
+                PORT += 1  # If address in use, increment port and try again
+                continue
+            else:
+                raise
+        break  # If server started successfully, break the loop
 
 t = threading.Thread(target=start_server)
 t.start()