JavaScript – Cross-Origin Request for Local File

It is XSS and it is forbidden. You should really not do things that way.

If you really need to, make your AJAX code call the local code (PHP, ASP, whatever) on blah.com and make it behave like client and fetch whatever you need from foo.com and return that back to the client. If you use PHP, you can do this with fopen('www.foo.com/blah.html', 'r') and then reading the contents as if it was a regular file.

Of course, allow_remote_url_fopen (or whatever it is called exactly) needs to be enabled in your php.ini.

Well, if you are having a problem with the cross domain policy, you might need to build some sort of proxy that will do the request for you. (Its pretty simple to make)

If you want to open a JavaScript file to make an Ajax request I'd use Dojo to parse the XML.

You have a nice example here: http://dojotoolkit.org/reference-guide/dojo/xhrGet.html

Hope it helps.