/**
  * Set a header field.
  *
  * @param string $field
  */
 public function setHeader($field)
 {
     $header = $this->header->splitField($field);
     if (false !== $header) {
         $this->header->setField($header['name'], $header['value']);
     }
 }
 /**
  * Set a header field.
  *
  * @param string $name
  * @param string $value
  */
 public function setHeader($name, $value)
 {
     $this->header->setField($name, $value);
 }