code: public function getCookieValue($host, $path, $name)
      {
          return $this->cookie_jar->getCookieValue($host, $path, $name);
      }
docs: Reads the most specific cookie value from the browser cookies.
  
  @param string $host        Host to search.
  @param string $path        Applicable path.
  @param string $name        Name of cookie to read.
  
  @return string             False if not present, else the value as a string.