use function Innmind\Crawler\bootstrap;
use Innmind\OperatingSystem\Factory;
use Innmind\UrlResolver\UrlResolver;
use Innmind\Url\Url;
use Innmind\Http\{
    Message\Request\Request,
    Message\Method\Method,
    ProtocolVersion,
};
use function Innmind\Html\bootstrap as reader;

$os = Factory::build();

$crawl = bootstrap(
    $os->remote()->http(),
    $os->clock(),
    reader(),
    new UrlResolver
);

$resource = $crawl(
    new Request(
        Url::of('https://en.wikipedia.org/wiki/H2g2'),
        new Method('GET'),
        new ProtocolVersion(2, 0),
    ),
);

在这里 $resource 是 HttpResource 的一个实例。