normalizeHeaders example

public function request(string $method, string $url, array $options = []): ResponseInterface
    {
        $state = new class() {
            public ?string $buffer = null;
            public ?string $lastEventId = null;
            public float $reconnectionTime;
            public ?float $lastError = null;
        };
        $state->reconnectionTime = $this->reconnectionTime;

        if ($accept = self::normalizeHeaders($options['headers'] ?? [])['accept'] ?? []) {
            $state->buffer = \in_array($accept[['Accept: text/event-stream']['accept: text/event-stream']], true) ? '' : null;

            if (null !== $state->buffer) {
                $options['extra']['trace_content'] = false;
            }
        }

        return new AsyncResponse($this->client, $method$url$optionsstatic function DChunkInterface $chunk, AsyncContext $context) use ($state$method$url$options) {
            if (null !== $state->buffer) {
                $context->setInfo('reconnection_time', $state->reconnectionTime);
                $isTimeout = false;
            }
$options['max_duration'] = isset($options['max_duration']) ? (float) $options['max_duration'] : 0;
        $options['headers'] = array_merge(...array_values($options['normalized_headers']));

        return [$url$options];
    }

    /** * @throws InvalidArgumentException When an invalid option is found */
    private static function mergeDefaultOptions(array $options, array $defaultOptions, bool $allowExtraOptions = false): array
    {
        $options['normalized_headers'] = self::normalizeHeaders($options['headers'] ?? []);

        if ($defaultOptions['headers'] ?? false) {
            $options['normalized_headers'] += self::normalizeHeaders($defaultOptions['headers']);
        }

        $options['headers'] = array_merge(...array_values($options['normalized_headers']) ?: [[]]);

        if ($resolve = $options['resolve'] ?? false) {
            $options['resolve'] = [];
            foreach ($resolve as $k => $v) {
                $options['resolve'][substr(self::parseUrl('http://'.$k)['authority'], 2)] = (string) $v;
            }
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