vendor/guzzlehttp/guzzle/src/HandlerStack.php

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<?php

namespace GuzzleHttp;

use GuzzleHttp\Promise\PromiseInterface;
use Psr\Http\Message\RequestInterface;
use Psr\Http\Message\ResponseInterface;

/**
 * Creates a composed Guzzle handler function by stacking middlewares on top of
 * an HTTP handler function.
 *
 * @final
 */
class HandlerStack
{
    /**
     * @var (callable(RequestInterface, array): PromiseInterface)|null
     */
    private $handler;

    /**
     * @var array{(callable(callable(RequestInterface, array): PromiseInterface): callable), (string|null)}[]
     */
    private $stack = [];

    /**
     * @var (callable(RequestInterface, array): PromiseInterface)|null
     */
    private $cached;

    /**
     * Creates a default handler stack that can be used by clients.
     *
     * The returned handler will wrap the provided handler or use the most
     * appropriate default handler for your system. The returned HandlerStack has
     * support for cookies, redirects, HTTP error exceptions, and preparing a body
     * before sending.
     *
     * The returned handler stack can be passed to a client in the "handler"
     * option.
     *
     * @param (callable(RequestInterface, array): PromiseInterface)|null $handler HTTP handler function to use with the stack. If no
     *                                                                            handler is provided, the best handler for your
     *                                                                            system will be utilized.
     */
    public static function create(?callable $handler = null): self
    {
        $stack = new self($handler ?: Utils::chooseHandler());
        $stack->push(Middleware::httpErrors(), 'http_errors');
        $stack->push(Middleware::redirect(), 'allow_redirects');
        $stack->push(Middleware::cookies(), 'cookies');
        $stack->push(Middleware::prepareBody(), 'prepare_body');

        return $stack;
    }

    /**
     * @param (callable(RequestInterface, array): PromiseInterface)|null $handler Underlying HTTP handler.
     */