Bitpay\Client\Request::getHeadersAsString PHP Method

    public function getHeadersAsString()
    {
        $headers = $this->getHeaders();
        $return = '';
        foreach ($headers as $h => $v) {
            $return .= sprintf("%s: %s\r\n", $h, $v);
        }
        return $return . "\r\n";
    }