/**
  * Flush the headers
  */
 public function flushHeaders()
 {
     foreach ($this->_header as $key => $value) {
         if ($key === 'fields') {
             foreach ($this->_header['fields'] as $field => $value) {
                 header(Steelcode_String_Helper::replace("_", "-", $field) . ": " . $value);
             }
             continue;
         }
         header($value);
     }
 }