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<?php
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namespace GuzzleHttp\Handler;
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use GuzzleHttp\Utils;
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/**
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 * @internal
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 */
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final class HeaderProcessor
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{
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    /**
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     * Returns the HTTP version, status code, reason phrase, and headers.
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     *
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     * @param string[] $headers
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     *
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     * @throws \RuntimeException
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     *
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     * @return array{0:string, 1:int, 2:?string, 3:array}
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     */
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    public static function parseHeaders(array $headers): array
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    {
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        if ($headers === []) {
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            throw new \RuntimeException('Expected a non-empty array of header data');
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        }
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        $parts = \explode(' ', \array_shift($headers), 3);
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        $version = \explode('/', $parts[0])[1] ?? null;
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        if ($version === null) {
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            throw new \RuntimeException('HTTP version missing from header data');
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        }
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        $status = $parts[1] ?? null;
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        if ($status === null) {
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            throw new \RuntimeException('HTTP status code missing from header data');
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        }
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        return [$version, (int) $status, $parts[2] ?? null, Utils::headersFromLines($headers)];
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    }
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}