Shared Sign-On prevents Drupal's core HTTP request system check from working by default

Please see a detailed explanation here: http://drupal.org/node/333345#comment-1112630

The addition of the extra line to the Target URL ought to fix it, I think. As long as that is included by default and users leave it alone, this problem seems to go away. However, in its current state the Shared Sign-On module breaks the HTTP check if installed out of the box with default settings, so the default settings should be updated as a matter of urgency.