cloudfoundry cli trusted ssl certificate

I am curious where the the certificate store the cf cli is using?

E.g. cf api https://api.xxx.xx.xip.io.

I installed the certificate to my maverick login/system keychain and made
it always trust (safari seems works fine with the certificate)

However, the command line through terminal still pop up the certificate is
not trusted.

Similar question about other system, E.g. windows, ubuntu.... How to import
a self signed certificate and make cf cli work.

Thanks

-Shaozhen