$i = strrpos($result, '/');
                $result = $i ? substr($result, 0, $i) : '';
                $path = substr_replace($path, '/', 0, 4);
            } else {
                $i = strpos($path, '/', 1) ?: \strlen($path);
                $result .= substr($path, 0, $i);
                $path = substr($path, $i);
            }
        }

        return $result;
    }

    /**
     * Merges and encodes a query array with a query string.
     *
     * @throws InvalidArgumentException When an invalid query-string value is passed
     */
    private static function mergeQueryString(?string $queryString, array $queryArray, bool $replace): ?string
    {
        if (!$queryArray) {
            return $queryString;
        }

        $query = [];

        if (null !== $queryString) {
            foreach (explode('&', $queryString) as $v) {
                if ('' !== $v) {
                    $k = urldecode(explode('=', $v, 2)[0]);
                    $query[$k] = (isset($query[$k]) ? $query[$k].'&' : '').$v;
                }
            }
        }

        if ($replace) {
            foreach ($queryArray as $k => $v) {
                if (null === $v) {
                    unset($query[$k]);
                }
            }
        }

        $queryString = http_build_query($queryArray, '', '&', \PHP_QUERY_RFC3986);
        $queryArray = [];

        if ($queryString) {
            if (str_contains($queryString, '%')) {
                // https://tools.ietf.org/html/rfc3986#section-2.3 + some chars not encoded by browsers
                $queryString = strtr($queryString, [
                    '%21' => '!',
                    '%24' => '$',
                    '%28' => '(',
                    '%29' => ')',
                    '%2A' => '*',
                    '%2F' => '/',
                    '%3A' => ':',
                    '%3B' => ';',
                    '%40' => '@',
                    '%5B' => '[',
                    '%5D' => ']',
                ]);
            }

            foreach (explode('&', $queryString) as $v) {
                $queryArray[rawurldecode(explode('=', $v, 2)[0])] = $v;
            }
        }

        return implode('&', $replace ? array_replace($query, $queryArray) : ($query + $queryArray));
    }

    /**
     * Loads proxy configuration from the same environment variables as curl when no proxy is explicitly set.
     */
    private static function getProxy(?string $proxy, array $url, ?string $noProxy): ?array
    {
        if (null === $proxy = self::getProxyUrl($proxy, $url)) {
            return null;
        }

        $proxy = (parse_url($proxy) ?: []) + ['scheme' => 'http'];

        if (!isset($proxy['host'])) {
            throw new TransportException('Invalid HTTP proxy: host is missing.');
        }

        if ('http' === $proxy['scheme']) {
            $proxyUrl = 'tcp://'.$proxy['host'].':'.($proxy['port'] ?? '80');
        } elseif ('https' === $proxy['scheme']) {
            $proxyUrl = 'ssl://'.$proxy['host'].':'.($proxy['port'] ?? '443');
        } else {
            throw new TransportException(sprintf('Unsupported proxy scheme "%s": "http" or "https" expected.', $proxy['scheme']));
        }

        $noProxy = $noProxy ?? $_SERVER['no_proxy'] ?? $_SERVER['NO_PROXY'] ?? '';
        $noProxy = $noProxy ? preg_split('/[\s,]+/', $noProxy) : [];

        return [
            'url' => $proxyUrl,
            'auth' => isset($proxy['user']) ? 'Basic '.base64_encode(rawurldecode($proxy['user']).':'.rawurldecode($proxy['pass'] ?? '')) : null,
            'no_proxy' => $noProxy,
        ];
    }

    private static function getProxyUrl(?string $proxy, array $url): ?string
    {
        if (null !== $proxy) {
            return $proxy;
        }

        // Ignore HTTP_PROXY except on the CLI to work around httpoxy set of vulnerabilities
        $proxy = $_SERVER['http_proxy'] ?? (\in_array(\PHP_SAPI, ['cli', 'phpdbg'], true) ? $_SERVER['HTTP_PROXY'] ?? null : null) ?? $_SERVER['all_proxy'] ?? $_SERVER['ALL_PROXY'] ?? null;

        if ('https:' === $url['scheme']) {
            $proxy = $_SERVER['https_proxy'] ?? $_SERVER['HTTPS_PROXY'] ?? $proxy;
        }

        return $proxy;
    }

    private static function shouldBuffer(array $headers): bool
    {
        if (null === $contentType = $headers['content-type'][0] ?? null) {
            return false;
        }

        if (false !== $i = strpos($contentType, ';')) {
            $contentType = substr($contentType, 0, $i);
        }

        return $contentType && preg_match('#^(?:text/|application/(?:.+\+)?(?:json|xml)$)#i', $contentType);
    }
}