Cisco Web Security Appliance

What is favicon.ico and why does my browser request it secretly?

Document ID: 117995

Updated: Jul 17, 2014

Contributed by Josh Wolfer and Siddharth Rajpathak, Cisco TAC Engineers.



Why does my browser silently send requests for 'favicon.ico' file for multiple domains?

: Cisco Web Security Appliance (WSA), all versions of AsyncOS

You may have noticed that when you browse to different domains, your browser is sending requests for http://<>/favicon.ico, behind the scenes 

Modern browsers will show an icon to the left of the URL. This known as the 'favicon.ico' and is typically fetched from Your browser will automatically request it when browsing to different sites. If your browser receives a valid favicon.ico file, it will display this icon. If it fails, it will not display a special icon.

In either circumstances, browsing is not affected.

More information on the favicon can be found at

Updated: Jul 17, 2014
Document ID: 117995