favicon.ico not found error?

I have an application that uses Spring Security 3 runs on Tomcat. I didn't define any favicon for my website however when I run my application from my IDE sometimes after I login from my login pages it redirects my page to:

http://localhost:8080/favicon.ico

and says:

404 Not Found

There is a topic here: http://forum.springsource.org/showthread.开发者_JAVA技巧php?100901-redirect-to-favicon.ico however I didn't define a favicon.ico does Spring Security 3 wants it by default(if yes, why it happens sometimes?)

Here is the explanation:

The issue is, when the browser cache is empty and a user comes in, here is what happens:

• the user requests URL "/". This URL is cached.
• the browser makes a requests to "/favicon.ico". This URL becomes the new URL where to redirect to upon authentication.
• the user posts the login form and is redirected to "/favicon.ico".

To fix this, you need to set "/favicon.ico" as being a non-secured resources:

<intercept-url pattern="/favicon.ico" access="ROLE_ANONYMOUS" />

Taken from: http://blog.idm.fr/2010/09/spring-security-redirecting-to-faviconico.html

For Grails 3.0.11 & Spring Security Core 3.0.2, add "IS_AUTHENTICATED_ANONYMOUSLY" in application.groovy in the section:

grails.plugin.springsecurity.controllerAnnotations.staticRules = [
...
..
.
[pattern: '/favicon.ico',      access: ['IS_AUTHENTICATED_ANONYMOUSLY']]
]