validate() returns FALSE on realms with wildcard about lightopenid HOT 3 OPEN

It isn't improper in my opinion. In such case, there's no way to properly guess 
returnUrl, so the user must do so himself.

Or do you have any idea how to do it properly?

Maybe it would be better to check if realm contains wildcard and fallback to 
$_SERVER['HTTP_HOST'] if it does?

In my case the real issue is not '$this->returnUrl' but failed validation. I 
think it would be ok to check in validate() if returnUrl/realm contains 
wildcard and if it does check if returnUrl (stripped of wildcard) is suffix of 
$this->data['openid_return_to'].

Another solution would be to throw exception if realm contains wildcard and 
returnUrl is not set explicitly by user. In this case user of LightOpenID 
object would be at least aware that it's necessary to set returnUrl properly 
(I've spent hour tracking cause of failed validation ;))

Created a merge request to fix this issue: 
https://gitorious.org/lightopenid/lightopenid/merge_requests/13