Ajax requests with different WordPress Address and Site Address setup

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I have a user using my plugin with the following wp setup 

WordPress Address (URL)
http://server1.theirhost.com/~acct/somewebsite.com/wordpress

Site Address (URL)
http://www.somewebsite.com

I am using admin_url( ‘admin-ajax.php’ ) to pull the ajax url, which returns

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http://server1.theirhost.com/~acct/somewebsite.com/wordpress/wp-admin/admin-ajax.php

When doing ajax requests from a page on http://www.somewebsite.com, it looks like the “same origin policy” is in effect and the requests fail. Any suggestions on how to fix this issue?

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  1. Depending on how you’re mapping somewebsite.com, you can probably just define ajaxurl differently:

    var ajaxurl = 'http://www.somewebsite.com/admin-ajax.php';

    If you need something more generalizable, you could filter admin_url, sniff out whether it’s asking for admin-ajax.php, and if so, then rewrite it using home_url() or something like that.

    Getting cross-domain ajax to work is possible (with a proxy approach, for instance) but it’s best to avoid it if at all possible.