Google Apps OpenID url
问题 Problem: My organisation, ExampleFooBar, uses Google Apps. On our website I want to enable OpenID Single Sign-In (like StackOverflow), but only allow @examplefoobar.com email addresses to sign in. What OpenID url should I use for a Google Apps email address? As per comments on Include OpenId in drupal, the domain http://www.google.com/profiles/<username> can be used for normal Google accounts, but this doesn't work for Google Apps accounts. Google also provides the url https://www.google.com