I want to add the below snippet to my wordpress installation.

<?php header("Access-Control-Allow-Origin: *");?>

I don't want to add it in every template header as there are many of them and I have 60 networks with 2-3 sites in each network. In what file should I add this snippet so that it has effect across the entire wordpress installation?

  • Any update on this? – atwellpub May 28 '14 at 22:58

I would prefer to do this at web server level.

If you are on NGINX server, you can use in your site conf file:

add_header Access-Control-Allow-Origin *;

If you are on Apache server, you can use in your .htaccess:

Header set Access-Control-Allow-Origin "*"

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