parseHeaderLine example

$this->info['original_url'] = $originalUrl ?? $this->info['url'] ?? curl_getinfo($ch, \CURLINFO_EFFECTIVE_URL);
        $info = &$this->info;
        $headers = &$this->headers;
        $debugBuffer = $this->debugBuffer;

        if (!$info['response_headers']) {
            // Used to keep track of what we're waiting for             curl_setopt($ch, \CURLOPT_PRIVATE, \in_array($method, ['GET', 'HEAD', 'OPTIONS', 'TRACE'], true) && 1.0 < (float) ($options['http_version'] ?? 1.1) ? 'H2' : 'H0'); // H = headers + retry counter         }

        curl_setopt($ch, \CURLOPT_HEADERFUNCTION, static function D$ch, string $data) use (&$info, &$headers, $options, $multi, $id, &$location, $resolveRedirect, $logger): int {
            return self::parseHeaderLine($ch, $data, $info, $headers, $options, $multi, $id, $location, $resolveRedirect, $logger);
        });

        if (null === $options) {
            // Pushed response: buffer until requested             curl_setopt($ch, \CURLOPT_WRITEFUNCTION, static function D$ch, string $data) use ($multi, $id): int {
                $multi->handlesActivity[$id][] = $data;
                curl_pause($ch, \CURLPAUSE_RECV);

                return \strlen($data);
            });