http_request_host_is_external filter-hook . WP 3.6.0

Check if HTTP request is external or not.

Allows to change and allow external requests for the HTTP request.

Usage

add_filter( 'http_request_host_is_external', 'filter_function_name_8915', 10, 3 );
function filter_function_name_8915( $false, $host, $url ){
	// filter...

	return $false;
}

$false(true/false)

false Whether HTTP request is external or not.

$host(string)

IP of the requested host.

$url(string)

URL of the requested host.

Where the hook is called

if ( ! apply_filters( 'http_request_host_is_external', false, $host, $url ) ) {

Where the hook is used (in WP core)

add_filter( 'http_request_host_is_external', 'allowed_http_request_hosts', 10, 2 );

add_filter( 'http_request_host_is_external', 'ms_allowed_http_request_hosts', 20, 2 );