vendor/guzzlehttp/guzzle/src/Handler/CurlFactory.php

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<?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;

/**
 * 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 $options): EasyHandle
    {
        if (isset($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);