On Ajax cross-domain session and Cross-domain access _ajax related

I. About AJAX Cross-domain requests, with JSONP always unsuccessful, although you can return data, but error at the error. The reason is that the returned data format is not JSONP format. However, a request constructed with C # can return data.

Two. Third party AJAX requests must be unable to obtain the session of your current user.

The task is this, Alipay's page return notify page (this page is asynchronous access), and my C # processing has a processing module, need to judge if it is already logged in add integral and so on operation, the result is always get no session data, but clearly login ah. The misconception here is that our current domain is definitely logged in, but there is no login for the asynchronous request at the Alipay side.