Proyectos de Subversion Moodle

<?php

namespace GuzzleHttp\Handler;

use GuzzleHttp\Exception\ConnectException;

use GuzzleHttp\Exception\RequestException;

use GuzzleHttp\Promise as P;

use GuzzleHttp\Promise\FulfilledPromise;

use GuzzleHttp\Promise\PromiseInterface;

use GuzzleHttp\Psr7\LazyOpenStream;

use GuzzleHttp\TransferStats;

use GuzzleHttp\Utils;

use Psr\Http\Message\RequestInterface;

use Psr\Http\Message\UriInterface;

/**

 * Creates curl resources from a request

 *

 * @final

 */

class CurlFactory implements CurlFactoryInterface

{

    public const CURL_VERSION_STR = 'curl_version';

    /**

     * @deprecated

     */

    public const LOW_CURL_VERSION_NUMBER = '7.21.2';

    /**

     * @var resource[]|\CurlHandle[]

     */

    private $handles = [];

    /**

     * @var int Total number of idle handles to keep in cache

     */

    private $maxHandles;

    /**

     * @param int $maxHandles Maximum number of idle handles.

     */

    public function __construct(int $maxHandles)

    {

        $this->maxHandles = $maxHandles;

    }

    public function create(RequestInterface $request, array $options): EasyHandle

    {

        $protocolVersion = $request->getProtocolVersion();

        if ('2' === $protocolVersion || '2.0' === $protocolVersion) {

            if (!self::supportsHttp2()) {

                throw new ConnectException('HTTP/2 is supported by the cURL handler, however libcurl is built without HTTP/2 support.', $request);

            }

        } elseif ('1.0' !== $protocolVersion && '1.1' !== $protocolVersion) {

            throw new ConnectException(sprintf('HTTP/%s is not supported by the cURL handler.', $protocolVersion), $request);

        }

        if (isset($options['curl']['body_as_string'])) {

            $options['_body_as_string'] = $options['curl']['body_as_string'];

            unset($options['curl']['body_as_string']);

        }

        $easy = new EasyHandle();

        $easy->request = $request;

        $easy->options = $options;

        $conf = $this->getDefaultConf($easy);

        $this->applyMethod($easy, $conf);

        $this->applyHandlerOptions($easy, $conf);

        $this->applyHeaders($easy, $conf);

        unset($conf['_headers']);

        // Add handler options from the request configuration options

        if (isset($options['curl'])) {

            $conf = \array_replace($conf, $options['curl']);

        }

        $conf[\CURLOPT_HEADERFUNCTION] = $this->createHeaderFn($easy);

        $easy->handle = $this->handles ? \array_pop($this->handles) : \curl_init();

        curl_setopt_array($easy->handle, $conf);

        return $easy;

    }

    private static function supportsHttp2(): bool

    {

        static $supportsHttp2 = null;

        if (null === $supportsHttp2) {

            $supportsHttp2 = self::supportsTls12()

                && defined('CURL_VERSION_HTTP2')

                && (\CURL_VERSION_HTTP2 & \curl_version()['features']);

        }

        return $supportsHttp2;

    }

    private static function supportsTls12(): bool

    {

        static $supportsTls12 = null;

        if (null === $supportsTls12) {

            $supportsTls12 = \CURL_SSLVERSION_TLSv1_2 & \curl_version()['features'];

        }

        return $supportsTls12;

    }

    private static function supportsTls13(): bool

    {

        static $supportsTls13 = null;

        if (null === $supportsTls13) {

            $supportsTls13 = defined('CURL_SSLVERSION_TLSv1_3')

                && (\CURL_SSLVERSION_TLSv1_3 & \curl_version()['features']);

        }

        return $supportsTls13;

    }

    public function release(EasyHandle $easy): void

    {

        $resource = $easy->handle;

        unset($easy->handle);

        if (\count($this->handles) >= $this->maxHandles) {

            \curl_close($resource);

        } else {

            // Remove all callback functions as they can hold onto references

            // and are not cleaned up by curl_reset. Using curl_setopt_array

            // does not work for some reason, so removing each one

            // individually.

            \curl_setopt($resource, \CURLOPT_HEADERFUNCTION, null);

            \curl_setopt($resource, \CURLOPT_READFUNCTION, null);

            \curl_setopt($resource, \CURLOPT_WRITEFUNCTION, null);

            \curl_setopt($resource, \CURLOPT_PROGRESSFUNCTION, null);

            \curl_reset($resource);

            $this->handles[] = $resource;

        }

    }

    /**

     * Completes a cURL transaction, either returning a response promise or a

     * rejected promise.

     *

     * @param callable(RequestInterface, array): PromiseInterface $handler

     * @param CurlFactoryInterface                                $factory Dictates how the handle is released

     */

    public static function finish(callable $handler, EasyHandle $easy, CurlFactoryInterface $factory): PromiseInterface

    {

        if (isset($easy->options['on_stats'])) {

            self::invokeStats($easy);

        }

        if (!$easy->response || $easy->errno) {

            return self::finishError($handler, $easy, $factory);

        }

        // Return the response if it is present and there is no error.

        $factory->release($easy);

        // Rewind the body of the response if possible.

        $body = $easy->response->getBody();

        if ($body->isSeekable()) {

            $body->rewind();

        }

        return new FulfilledPromise($easy->response);

    }

    private static function invokeStats(EasyHandle $easy): void

    {

        $curlStats = \curl_getinfo($easy->handle);

        $curlStats['appconnect_time'] = \curl_getinfo($easy->handle, \CURLINFO_APPCONNECT_TIME);

        $stats = new TransferStats(

            $easy->request,

            $easy->response,

            $curlStats['total_time'],

            $easy->errno,

            $curlStats

        );

        ($easy->options['on_stats'])($stats);

    }

    /**

     * @param callable(RequestInterface, array): PromiseInterface $handler

     */

    private static function finishError(callable $handler, EasyHandle $easy, CurlFactoryInterface $factory): PromiseInterface

    {

        // Get error information and release the handle to the factory.

        $ctx = [

            'errno' => $easy->errno,

            'error' => \curl_error($easy->handle),

            'appconnect_time' => \curl_getinfo($easy->handle, \CURLINFO_APPCONNECT_TIME),

        ] + \curl_getinfo($easy->handle);

        $ctx[self::CURL_VERSION_STR] = self::getCurlVersion();

        $factory->release($easy);

        // Retry when nothing is present or when curl failed to rewind.

        if (empty($easy->options['_err_message']) && (!$easy->errno || $easy->errno == 65)) {

            return self::retryFailedRewind($handler, $easy, $ctx);

        }

        return self::createRejection($easy, $ctx);

    }

    private static function getCurlVersion(): string

    {

        static $curlVersion = null;

        if (null === $curlVersion) {

            $curlVersion = \curl_version()['version'];

        }

        return $curlVersion;

    }

    private static function createRejection(EasyHandle $easy, array $ctx): PromiseInterface

    {

        static $connectionErrors = [

            \CURLE_OPERATION_TIMEOUTED => true,

            \CURLE_COULDNT_RESOLVE_HOST => true,

            \CURLE_COULDNT_CONNECT => true,

            \CURLE_SSL_CONNECT_ERROR => true,

            \CURLE_GOT_NOTHING => true,

        ];

        if ($easy->createResponseException) {

            return P\Create::rejectionFor(

                new RequestException(

                    'An error was encountered while creating the response',

                    $easy->request,

                    $easy->response,

                    $easy->createResponseException,

                    $ctx

                )

            );

        }

        // If an exception was encountered during the onHeaders event, then

        // return a rejected promise that wraps that exception.

        if ($easy->onHeadersException) {

            return P\Create::rejectionFor(

                new RequestException(

                    'An error was encountered during the on_headers event',

                    $easy->request,

                    $easy->response,

                    $easy->onHeadersException,

                    $ctx

                )

            );

        }

        $uri = $easy->request->getUri();

        $sanitizedError = self::sanitizeCurlError($ctx['error'] ?? '', $uri);

        $message = \sprintf(

            'cURL error %s: %s (%s)',

            $ctx['errno'],

            $sanitizedError,

            'see https://curl.haxx.se/libcurl/c/libcurl-errors.html'

        );

        if ('' !== $sanitizedError) {

            $redactedUriString = \GuzzleHttp\Psr7\Utils::redactUserInfo($uri)->__toString();

            if ($redactedUriString !== '' && false === \strpos($sanitizedError, $redactedUriString)) {

                $message .= \sprintf(' for %s', $redactedUriString);

            }

        }

        // Create a connection exception if it was a specific error code.

        $error = isset($connectionErrors[$easy->errno])

            ? new ConnectException($message, $easy->request, null, $ctx)

            : new RequestException($message, $easy->request, $easy->response, null, $ctx);

        return P\Create::rejectionFor($error);

    }

    private static function sanitizeCurlError(string $error, UriInterface $uri): string

    {

        if ('' === $error) {

            return $error;

        }

        $baseUri = $uri->withQuery('')->withFragment('');

        $baseUriString = $baseUri->__toString();

        if ('' === $baseUriString) {

            return $error;

        }

        $redactedUriString = \GuzzleHttp\Psr7\Utils::redactUserInfo($baseUri)->__toString();

        return str_replace($baseUriString, $redactedUriString, $error);

    }

    /**

     * @return array<int|string, mixed>

     */

    private function getDefaultConf(EasyHandle $easy): array

    {

        $conf = [

            '_headers' => $easy->request->getHeaders(),

            \CURLOPT_CUSTOMREQUEST => $easy->request->getMethod(),

            \CURLOPT_URL => (string) $easy->request->getUri()->withFragment(''),

            \CURLOPT_RETURNTRANSFER => false,

            \CURLOPT_HEADER => false,

            \CURLOPT_CONNECTTIMEOUT => 300,

        ];

        if (\defined('CURLOPT_PROTOCOLS')) {

            $conf[\CURLOPT_PROTOCOLS] = \CURLPROTO_HTTP | \CURLPROTO_HTTPS;

        }

        $version = $easy->request->getProtocolVersion();

        if ('2' === $version || '2.0' === $version) {

            $conf[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_2_0;

        } elseif ('1.1' === $version) {

            $conf[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_1_1;

        } else {

            $conf[\CURLOPT_HTTP_VERSION] = \CURL_HTTP_VERSION_1_0;

        }

        return $conf;

    }

    private function applyMethod(EasyHandle $easy, array &$conf): void

    {

        $body = $easy->request->getBody();

        $size = $body->getSize();

        if ($size === null || $size > 0) {

            $this->applyBody($easy->request, $easy->options, $conf);

            return;

        }

        $method = $easy->request->getMethod();

        if ($method === 'PUT' || $method === 'POST') {

            // See https://datatracker.ietf.org/doc/html/rfc7230#section-3.3.2

            if (!$easy->request->hasHeader('Content-Length')) {

                $conf[\CURLOPT_HTTPHEADER][] = 'Content-Length: 0';

            }

        } elseif ($method === 'HEAD') {

            $conf[\CURLOPT_NOBODY] = true;

            unset(

                $conf[\CURLOPT_WRITEFUNCTION],

                $conf[\CURLOPT_READFUNCTION],

                $conf[\CURLOPT_FILE],

                $conf[\CURLOPT_INFILE]

            );

        }

    }

    private function applyBody(RequestInterface $request, array $options, array &$conf): void

    {

        $size = $request->hasHeader('Content-Length')

            ? (int) $request->getHeaderLine('Content-Length')

            : null;

        // Send the body as a string if the size is less than 1MB OR if the

        // [curl][body_as_string] request value is set.

        if (($size !== null && $size < 1000000) || !empty($options['_body_as_string'])) {

            $conf[\CURLOPT_POSTFIELDS] = (string) $request->getBody();

            // Don't duplicate the Content-Length header

            $this->removeHeader('Content-Length', $conf);

            $this->removeHeader('Transfer-Encoding', $conf);

        } else {

            $conf[\CURLOPT_UPLOAD] = true;

            if ($size !== null) {

                $conf[\CURLOPT_INFILESIZE] = $size;

                $this->removeHeader('Content-Length', $conf);

            }

            $body = $request->getBody();

            if ($body->isSeekable()) {

                $body->rewind();

            }

            $conf[\CURLOPT_READFUNCTION] = static function ($ch, $fd, $length) use ($body) {

                return $body->read($length);

            };

        }

        // If the Expect header is not present, prevent curl from adding it

        if (!$request->hasHeader('Expect')) {

            $conf[\CURLOPT_HTTPHEADER][] = 'Expect:';

        }

        // cURL sometimes adds a content-type by default. Prevent this.

        if (!$request->hasHeader('Content-Type')) {

            $conf[\CURLOPT_HTTPHEADER][] = 'Content-Type:';

        }

    }

    private function applyHeaders(EasyHandle $easy, array &$conf): void

    {

        foreach ($conf['_headers'] as $name => $values) {

            foreach ($values as $value) {

                $value = (string) $value;

                if ($value === '') {

                    // cURL requires a special format for empty headers.

                    // See https://github.com/guzzle/guzzle/issues/1882 for more details.

                    $conf[\CURLOPT_HTTPHEADER][] = "$name;";

                } else {

                    $conf[\CURLOPT_HTTPHEADER][] = "$name: $value";

                }

            }

        }

        // Remove the Accept header if one was not set

        if (!$easy->request->hasHeader('Accept')) {

            $conf[\CURLOPT_HTTPHEADER][] = 'Accept:';

        }

    }

    /**

     * Remove a header from the options array.

     *

     * @param string $name    Case-insensitive header to remove

     * @param array  $options Array of options to modify

     */

    private function removeHeader(string $name, array &$options): void

    {

        foreach (\array_keys($options['_headers']) as $key) {

            if (!\strcasecmp($key, $name)) {

                unset($options['_headers'][$key]);

                return;

            }

        }

    }

    private function applyHandlerOptions(EasyHandle $easy, array &$conf): void

    {

        $options = $easy->options;

        if (isset($options['verify'])) {

            if ($options['verify'] === false) {

                unset($conf[\CURLOPT_CAINFO]);

                $conf[\CURLOPT_SSL_VERIFYHOST] = 0;

                $conf[\CURLOPT_SSL_VERIFYPEER] = false;

            } else {

                $conf[\CURLOPT_SSL_VERIFYHOST] = 2;

                $conf[\CURLOPT_SSL_VERIFYPEER] = true;

                if (\is_string($options['verify'])) {

                    // Throw an error if the file/folder/link path is not valid or doesn't exist.

                    if (!\file_exists($options['verify'])) {

                        throw new \InvalidArgumentException("SSL CA bundle not found: {$options['verify']}");

                    }

                    // If it's a directory or a link to a directory use CURLOPT_CAPATH.

                    // If not, it's probably a file, or a link to a file, so use CURLOPT_CAINFO.

                    if (

                        \is_dir($options['verify'])

                        || (

                            \is_link($options['verify']) === true

                            && ($verifyLink = \readlink($options['verify'])) !== false

                            && \is_dir($verifyLink)

                        )

                    ) {

                        $conf[\CURLOPT_CAPATH] = $options['verify'];

                    } else {

                        $conf[\CURLOPT_CAINFO] = $options['verify'];

                    }

                }

            }

        }

        if (!isset($options['curl'][\CURLOPT_ENCODING]) && !empty($options['decode_content'])) {

            $accept = $easy->request->getHeaderLine('Accept-Encoding');

            if ($accept) {

                $conf[\CURLOPT_ENCODING] = $accept;

            } else {

                // The empty string enables all available decoders and implicitly

                // sets a matching 'Accept-Encoding' header.

                $conf[\CURLOPT_ENCODING] = '';

                // But as the user did not specify any encoding preference,

                // let's leave it up to server by preventing curl from sending

                // the header, which will be interpreted as 'Accept-Encoding: *'.

                // https://www.rfc-editor.org/rfc/rfc9110#field.accept-encoding

                $conf[\CURLOPT_HTTPHEADER][] = 'Accept-Encoding:';

            }

        }

        if (!isset($options['sink'])) {

            // Use a default temp stream if no sink was set.

            $options['sink'] = \GuzzleHttp\Psr7\Utils::tryFopen('php://temp', 'w+');

        }

        $sink = $options['sink'];

        if (!\is_string($sink)) {

            $sink = \GuzzleHttp\Psr7\Utils::streamFor($sink);

        } elseif (!\is_dir(\dirname($sink))) {

            // Ensure that the directory exists before failing in curl.

            throw new \RuntimeException(\sprintf('Directory %s does not exist for sink value of %s', \dirname($sink), $sink));

        } else {

            $sink = new LazyOpenStream($sink, 'w+');

        }

        $easy->sink = $sink;

        $conf[\CURLOPT_WRITEFUNCTION] = static function ($ch, $write) use ($sink): int {

            return $sink->write($write);

        };

        $timeoutRequiresNoSignal = false;

        if (isset($options['timeout'])) {

            $timeoutRequiresNoSignal |= $options['timeout'] < 1;

            $conf[\CURLOPT_TIMEOUT_MS] = $options['timeout'] * 1000;

        }

        // CURL default value is CURL_IPRESOLVE_WHATEVER

        if (isset($options['force_ip_resolve'])) {

            if ('v4' === $options['force_ip_resolve']) {

                $conf[\CURLOPT_IPRESOLVE] = \CURL_IPRESOLVE_V4;

            } elseif ('v6' === $options['force_ip_resolve']) {

                $conf[\CURLOPT_IPRESOLVE] = \CURL_IPRESOLVE_V6;

            }

        }

        if (isset($options['connect_timeout'])) {

            $timeoutRequiresNoSignal |= $options['connect_timeout'] < 1;

            $conf[\CURLOPT_CONNECTTIMEOUT_MS] = $options['connect_timeout'] * 1000;

        }

        if ($timeoutRequiresNoSignal && \strtoupper(\substr(\PHP_OS, 0, 3)) !== 'WIN') {

            $conf[\CURLOPT_NOSIGNAL] = true;

        }

        if (isset($options['proxy'])) {

            if (!\is_array($options['proxy'])) {

                $conf[\CURLOPT_PROXY] = $options['proxy'];

            } else {

                $scheme = $easy->request->getUri()->getScheme();

                if (isset($options['proxy'][$scheme])) {

                    $host = $easy->request->getUri()->getHost();

                    if (isset($options['proxy']['no']) && Utils::isHostInNoProxy($host, $options['proxy']['no'])) {

                        unset($conf[\CURLOPT_PROXY]);

                    } else {

                        $conf[\CURLOPT_PROXY] = $options['proxy'][$scheme];

                    }

                }

            }

        }

        if (isset($options['crypto_method'])) {

            $protocolVersion = $easy->request->getProtocolVersion();

            // If HTTP/2, upgrade TLS 1.0 and 1.1 to 1.2

            if ('2' === $protocolVersion || '2.0' === $protocolVersion) {

                if (

                    \STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT === $options['crypto_method']

                    || \STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT === $options['crypto_method']

                    || \STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT === $options['crypto_method']

                ) {

                    $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_2;

                } elseif (defined('STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT') && \STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT === $options['crypto_method']) {

                    if (!self::supportsTls13()) {

                        throw new \InvalidArgumentException('Invalid crypto_method request option: TLS 1.3 not supported by your version of cURL');

                    }

                    $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_3;

                } else {

                    throw new \InvalidArgumentException('Invalid crypto_method request option: unknown version provided');

                }

            } elseif (\STREAM_CRYPTO_METHOD_TLSv1_0_CLIENT === $options['crypto_method']) {

                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_0;

            } elseif (\STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT === $options['crypto_method']) {

                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_1;

            } elseif (\STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT === $options['crypto_method']) {

                if (!self::supportsTls12()) {

                    throw new \InvalidArgumentException('Invalid crypto_method request option: TLS 1.2 not supported by your version of cURL');

                }

                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_2;

            } elseif (defined('STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT') && \STREAM_CRYPTO_METHOD_TLSv1_3_CLIENT === $options['crypto_method']) {

                if (!self::supportsTls13()) {

                    throw new \InvalidArgumentException('Invalid crypto_method request option: TLS 1.3 not supported by your version of cURL');

                }

                $conf[\CURLOPT_SSLVERSION] = \CURL_SSLVERSION_TLSv1_3;

            } else {

                throw new \InvalidArgumentException('Invalid crypto_method request option: unknown version provided');

            }

        }

        if (isset($options['cert'])) {

            $cert = $options['cert'];

            if (\is_array($cert)) {

                $conf[\CURLOPT_SSLCERTPASSWD] = $cert[1];

                $cert = $cert[0];

            }

            if (!\file_exists($cert)) {

                throw new \InvalidArgumentException("SSL certificate not found: {$cert}");

            }

            // OpenSSL (versions 0.9.3 and later) also support "P12" for PKCS#12-encoded files.

            // see https://curl.se/libcurl/c/CURLOPT_SSLCERTTYPE.html

            $ext = pathinfo($cert, \PATHINFO_EXTENSION);

            if (preg_match('#^(der|p12)$#i', $ext)) {

                $conf[\CURLOPT_SSLCERTTYPE] = strtoupper($ext);

            }

            $conf[\CURLOPT_SSLCERT] = $cert;

        }

        if (isset($options['ssl_key'])) {

            if (\is_array($options['ssl_key'])) {

                if (\count($options['ssl_key']) === 2) {

                    [$sslKey, $conf[\CURLOPT_SSLKEYPASSWD]] = $options['ssl_key'];

                } else {

                    [$sslKey] = $options['ssl_key'];

                }

            }

            $sslKey = $sslKey ?? $options['ssl_key'];

            if (!\file_exists($sslKey)) {

                throw new \InvalidArgumentException("SSL private key not found: {$sslKey}");

            }

            $conf[\CURLOPT_SSLKEY] = $sslKey;

        }

        if (isset($options['progress'])) {

            $progress = $options['progress'];

            if (!\is_callable($progress)) {

                throw new \InvalidArgumentException('progress client option must be callable');

            }

            $conf[\CURLOPT_NOPROGRESS] = false;

            $conf[\CURLOPT_PROGRESSFUNCTION] = static function ($resource, int $downloadSize, int $downloaded, int $uploadSize, int $uploaded) use ($progress) {

                $progress($downloadSize, $downloaded, $uploadSize, $uploaded);

            };

        }

        if (!empty($options['debug'])) {

            $conf[\CURLOPT_STDERR] = Utils::debugResource($options['debug']);

            $conf[\CURLOPT_VERBOSE] = true;

        }

    }

    /**

     * This function ensures that a response was set on a transaction. If one

     * was not set, then the request is retried if possible. This error

     * typically means you are sending a payload, curl encountered a

     * "Connection died, retrying a fresh connect" error, tried to rewind the

     * stream, and then encountered a "necessary data rewind wasn't possible"

     * error, causing the request to be sent through curl_multi_info_read()

     * without an error status.

     *

     * @param callable(RequestInterface, array): PromiseInterface $handler

     */

    private static function retryFailedRewind(callable $handler, EasyHandle $easy, array $ctx): PromiseInterface

    {

        try {

            // Only rewind if the body has been read from.

            $body = $easy->request->getBody();

            if ($body->tell() > 0) {

                $body->rewind();

            }

        } catch (\RuntimeException $e) {

            $ctx['error'] = 'The connection unexpectedly failed without '

                .'providing an error. The request would have been retried, '

                .'but attempting to rewind the request body failed. '

                .'Exception: '.$e;

            return self::createRejection($easy, $ctx);

        }

        // Retry no more than 3 times before giving up.

        if (!isset($easy->options['_curl_retries'])) {

            $easy->options['_curl_retries'] = 1;

        } elseif ($easy->options['_curl_retries'] == 2) {

            $ctx['error'] = 'The cURL request was retried 3 times '

                .'and did not succeed. The most likely reason for the failure '

                .'is that cURL was unable to rewind the body of the request '

                .'and subsequent retries resulted in the same error. Turn on '

                .'the debug option to see what went wrong. See '

                .'https://bugs.php.net/bug.php?id=47204 for more information.';

            return self::createRejection($easy, $ctx);

        } else {

            ++$easy->options['_curl_retries'];

        }

        return $handler($easy->request, $easy->options);

    }

    private function createHeaderFn(EasyHandle $easy): callable

    {

        if (isset($easy->options['on_headers'])) {

            $onHeaders = $easy->options['on_headers'];

            if (!\is_callable($onHeaders)) {

                throw new \InvalidArgumentException('on_headers must be callable');

            }

        } else {

            $onHeaders = null;

        }

        return static function ($ch, $h) use (

            $onHeaders,

            $easy,

            &$startingResponse

        ) {

            $value = \trim($h);

            if ($value === '') {

                $startingResponse = true;

                try {

                    $easy->createResponse();

                } catch (\Exception $e) {

                    $easy->createResponseException = $e;

                    return -1;

                }

                if ($onHeaders !== null) {

                    try {

                        $onHeaders($easy->response);

                    } catch (\Exception $e) {

                        // Associate the exception with the handle and trigger

                        // a curl header write error by returning 0.

                        $easy->onHeadersException = $e;

                        return -1;

                    }

                }

            } elseif ($startingResponse) {

                $startingResponse = false;

                $easy->headers = [$value];

            } else {

                $easy->headers[] = $value;

            }

            return \strlen($h);

        };

    }

    public function __destruct()

    {

        foreach ($this->handles as $id => $handle) {

            \curl_close($handle);

            unset($this->handles[$id]);

        }

    }

}