Graceful shutdown

When running the crawler as a long-lived CLI process, you may want to stop it cleanly with Ctrl+C (SIGINT) or SIGTERM instead of killing it mid-request.

The crawler automatically registers signal handlers when the pcntl extension is available. When a signal is received:

1. The crawler stops yielding new requests
2. Any in-flight requests complete normally
3. The finishedCrawling() method on your observers is called with FinishReason::Interrupted
4. The start() method returns FinishReason::Interrupted

use Spatie\Crawler\Crawler;
use Spatie\Crawler\Enums\FinishReason;

$reason = Crawler::create('https://example.com')
    ->start();

if ($reason === FinishReason::Interrupted) {
    echo "Crawl was interrupted by a signal\n";
}

No configuration is needed. This works out of the box on any system where the pcntl PHP extension is loaded.

This is especially useful when combining with crawling across requests. A graceful shutdown ensures that the crawl queue remains in a consistent state, so you can resume crawling later.