CORS: header("Access-Control-Allow-Origin: *") not working

  • This coding could also be set in a plugin. I did it in functions.php
    first line after <?php:
    header(“Access-Control-Allow-Origin: *”);

    Is not working. In Chrome console the following error is reported:
    XMLHttpRequest cannot load https://[Domain_A]/wp-admin/admin-ajax.php. No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘https://[Domain_B]&#8217; is therefore not allowed access. The response had HTTP status code 401.

    I don’t understand that, for I set the header, and therefor a ‘Access-Control-Allow-Origin’ header has to be present with wildcard, so it should work from all origins!

    Any ideas?

    Tom

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