Built-in Middleware

• Guzzle ships with middleware that runs on all requests when using the default handler stack
• httpErrors — throws exceptions for 4xx and 5xx responses
• Redirect — adds tracking details to response headers
• Cookies — attaches cookies to the request when a cookie jar is present
• PrepareBody — adds Content-Length, Content-Type, and Expect headers when the request has a body

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;
}