Cross-domain AJAX

At the core of every AJAX request lies the XMLHttpRequest object. One of the security restrictions of the XMLHttpRequest object is that cross domain requests cannot be made. You cannot use the XMLHttpRequest object on the portal page to fetch content from a server that resides on a different domain than the host portal. This restriction applies to sunportal.AJAXRequest and dojo.io.*. There are workarounds for this restriction, such as implementing a cross-domain proxy and on-demand JavaScript loading. You can find more information about these techniques on AJAX related websites.