private function line($name)
    {
        if ('(request-target)' == $name) {
            return $this->requestTargetLine();
        } else {
            return sprintf('%s: %s', $name, $this->headerValue($name));
        }
    }
private function line($name)
    {
        if ('(request-target)' == $name) {
            return $this->requestTargetLine();
        } else {
            return sprintf('%s: %s', $name, $this->headerValue($name));
        }
    }
@param string $name

@return string

@throws SignedHeaderNotPresentException