Cisco Cisco Web Security Appliance S360 信息指南
What is favicon.ico and why does my browser
request it secretly?
request it secretly?
Document ID: 117995
Contributed by Josh Wolfer and Siddharth Rajpathak, Cisco TAC
Engineers.
Engineers.
Jul 17, 2014
Contents
Question:
Question:
Why does my browser silently send requests for 'favicon.ico' file for multiple domains?
Environment: 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://<your.domain.com>/favicon.ico, behind the scenes
http://<your.domain.com>/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 website.com/favicon.ico. 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.
fetched from website.com/favicon.ico. 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 http://en.wikipedia.org/wiki/Favicon
Updated: Jul 17, 2014
Document ID: 117995