wp_headers filter-hook . WP 2.8.0

Filters the HTTP headers before they're sent to the browser.

Usage

add_filter( 'wp_headers', 'filter_function_name_1017', 10, 2 );
function filter_function_name_1017( $headers, $this ){
	// filter...

	return $headers;
}

$headers(array)

The list of headers to be sent.

$this(WP)

Current WordPress environment instance.

Where the hook is called

$headers = apply_filters( 'wp_headers', $headers, $this );

Where the hook is used (in WP core)

add_filter( 'wp_headers', array( $this, 'filter_iframe_security_headers' ) );