Specify Multiple Subdomains with Access Control Origin

I am trying to allow access to every subdomain on my site in order to allow cross subdomain AJAX calls. Is there a way to specify all subdomains of a site like *.example.com or alternatively, why does the following not work when I have more than one domain listed:

header('Access-Control-Allow-Origin: http://api.example.com http://www.example.com');

I have read through the following question which appears to be similar, if not the same as this one, other than the fact that I want access to subdomains and this one refers to general domains.

Access-Control-Allow-Origin Multiple Origin Domains?

If the above question is the solution to this problem, then how am I able to retrieve the origin from the header. It appears that $_SERVER[‘HTTP_ORIGIN’] is very unreliable and not even cross browser. I need to be able to see the origin in any browser that may show an error when trying to send an AJAX call using javascript.

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