Yaf_Response_Abstract::setHeader

A few examples of how to send headers from a controller.../* Set Content-Type */ $response = $this -> getResponse();            $response -> setHeader( 'Content-Type', 'text/html; charset=utf-8' );     $response -> response();/* Set HTTP Status */$response = $this -> getResponse();           $response -> setHeader( $this -> getRequest() -> getServer( 'SERVER_PROTOCOL' ), '404 Not Found' );           $response -> response();You could also use $_SERVER[ 'SERVER_PROTOCOL' ] however it is recommend to extend the request class do some cleaning of the super globals then you should be good to go.