About Spring Security 3.0.5 CAS Client

i have two projects,A(sic-sys-web) and B(audit-biz-web),and use cas server 3.4.8.

when i browser http://ip:port/A. it can direct to cas server https://ip:port/cas/login?service=http://ip:port/A,then i enter username and password,click submit.ok,cas server redirect to http://ip:port/A.

i have B link in A project.So i click javascript:window.top.location.replace('http://ip.port/B').but i am so sad,it also redirect to A .Why? anybody can help?

I use fiddler to capture all process as you can see attachment.

thanks.