/**
  * Adds a HTTP header.
  *
  * This method will not overwrite any existing HTTP header, but instead add
  * another value. Individual values can be retrieved with
  * getHeadersAsArray.
  *
  * @param string $name
  * @param string $value
  * @return void
  */
 function addHeader($name, $value)
 {
     $this->inner->addHeader($name, $value);
 }