WP function/filter for modifying http headers?

Question

Is there a dedicated WP function, action or filter to use when adding/modifying the HTTP headers?

For now I just hook a PHP header() call into the WP 'init' hook like this:

add_action('init', 'add_header_xua');
function add_header_xua(){
    if(!is_admin()){
        header('X-UA-Compatible: IE=edge,chrome=1');    
    }
}

But is this the correct way to do that?

Answer 1

The init action is the wrong place to do it. A better place would be at template_redirect, so that you only affect the front end view of the site and not the admin areas.

Answer 2

I know it's been a while, but if anyone else stumbles on this, I found a WordPress hook specifically for modifying HTTP headers. The hook is wp_headers and it's called in the wp class.

The first argument passed is an array of headers with the header name as the key. The second argument is a reference to the wp class object.