wordpress cors policy no 'access-control-allow-origin' code example

Example 1: access-control-allow-origin htaccess

<IfModule mod_headers.c>    
    Header set Access-Control-Allow-Origin *
</IfModule>

Example 2: access-control-allow-origin htaccess

Header set Access-Control-Allow-Origin *

Example 3: wordpress Access-Control-Allow-Origin

function add_cors_http_header(){
    header("Access-Control-Allow-Origin: *");
}
add_action('init','add_cors_http_header');