[eluser]Ajaxboy[/eluser]
I think it has to do with the server response?. Some servers monitor how a request is made and limit "none" regular browser requests. Ajax is meant to be used locally/relative not across domains. The fact that cjax allows to retrieve data from across domains, is a unique feature that no other Ajax application allows.
However you should try to use a relative url when using ajax, it is just common practice, some times there are issues when using the full url in ajax.
I assume, you are using source forge as host? since that is what was displayed on the request earlier. They do have that limitation and not allow remote requests. But I do see how someone's intention to want to enter an absolute url for a local ajax request, the problem with this is that is not consistent and some browsers/servers have limitations with this action and that is why is treaty as an entire "foreign" url, however I see how someone would want to do that if they chooses to and their host allows it, in a future version I will introduce a setting where you can allow local request with full url for anyone who wants to do that. Though, it was avoided for a reason.