A cache plugin in WP will cache PHP output, but does it include HTTP header? For example, add a piece of code as following:

add_action('wp', 'my_cookie' );
function my_cookie() {
    setcookie('my_cookie', 'value');

Will my_cookie be saved to client browser when served by cached page?

Read more here: Will setcookie work if there is a cache plugin installed?


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