I am keeping get this error while using google api:

"hostname in certificate didn't match: != <*.googleapis.com> OR OR <*.googleapis.com>"

so I googled and here is the answer:
http://forum.springsource.org/showthread.php?114685-Samples-OpenId-Google-Login-Hostname-in-Certificate-didn-t-match

basically do not use httpclient:4.1.2 for this kind of operations