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Help Resolving a CORS issue


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I am trying to serve a linear video ad across domains. The preroll will not play and I am receiving the following error

A wildcard '*' cannot be used in the 'Access-Control-Allow-Origin' header when the credentials flag is true. Origin 'http://example.com' is therefore not allowed access. The credentials mode of an XMLHttpRequest is controlled by the withCredentials attribute.

I made changes to the to / www / delivery / spc.php file commenting header('Access-Control-Allow-Origin: *'); and adding 

MAX_header('Access-Control-Allow-Origin: https://example.com');
MAX_header('Access-Control-Allow-Credentials: true');

I am still receiving the same error. If someone can point in the direction to resolving this issue it would be greatly appreciated.

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