public function createResponse()
    {
        if (empty($this->headers)) {
            throw new \RuntimeException('No headers have been received');
        }

        // HTTP-version SP status-code SP reason-phrase
        $startLine = explode(' ', array_shift($this->headers), 3);
        $headers = \GuzzleHttp\headers_from_lines($this->headers);
        $normalizedKeys = \GuzzleHttp\normalize_header_keys($headers);

        if (!empty($this->options['decode_content'])
            && isset($normalizedKeys['content-encoding'])
        ) {
            $headers['x-encoded-content-encoding']
                = $headers[$normalizedKeys['content-encoding']];
            unset($headers[$normalizedKeys['content-encoding']]);
            if (isset($normalizedKeys['content-length'])) {
                $headers['x-encoded-content-length']
                    = $headers[$normalizedKeys['content-length']];

                $bodyLength = (int) $this->sink->getSize();
                if ($bodyLength) {
                    $headers[$normalizedKeys['content-length']] = $bodyLength;
                } else {
                    unset($headers[$normalizedKeys['content-length']]);
                }
            }
        }

        // Attach a response to the easy handle with the parsed headers.
        $this->response = new Response(
            $startLine[1],
            $headers,
            $this->sink,
            substr($startLine[0], 5),
            isset($startLine[2]) ? (string) $startLine[2] : null
        );
    }