reduced-jade•2y ago

Blocking network requests with crawlee PuppeteerCrawler

I'm trying to block network requests from specific domains within PuppeteerCrawler but can't get it to work. I'd like to run something like this:

page.on('request', (req) => {
                // If the URL doesn't include our keyword, ignore it
                if (req.url().includes('bouncex')) {
                    req.abort();
                    return;
                };
                req.continue();
            });

page.on('request', (req) => {
                // If the URL doesn't include our keyword, ignore it
                if (req.url().includes('bouncex')) {
                    req.abort();
                    return;
                };
                req.continue();
            });

But it has to be initiated before page.goto. I tried adding it to preNavigationHooks like so:

preNavigationHooks: [
        async ({ page }, goToOptions) => {
            goToOptions!.waitUntil = "networkidle2";
            goToOptions!.timeout = 3600000;
            await blocker.enableBlockingInPage(page);
            page.on('request', (req) => {
                // If the URL doesn't include our keyword, ignore it
                if (req.url().includes('bouncex')) {
                    req.abort();
                    return;
                };
                req.continue();
            });
            await page.setViewport(viewportConfig);
        },
    ],

preNavigationHooks: [
        async ({ page }, goToOptions) => {
            goToOptions!.waitUntil = "networkidle2";
            goToOptions!.timeout = 3600000;
            await blocker.enableBlockingInPage(page);
            page.on('request', (req) => {
                // If the URL doesn't include our keyword, ignore it
                if (req.url().includes('bouncex')) {
                    req.abort();
                    return;
                };
                req.continue();
            });
            await page.setViewport(viewportConfig);
        },
    ],

But this returns Error: Request is already handled! Is there a way to do this with PuppeteerCrawler?

3 Replies

ondro_k•2y ago

Hey, when you're using multiple Intercept Handlers, you need to check if a request has already been handled: if (interceptedRequest.isInterceptResolutionHandled()) return; . Take a look at this: https://pptr.dev/guides/network-interception#multiple-intercept-handlers-and-asynchronous-resolutions.

Request Interception | Puppeteer

Once request interception is enabled, every request will stall unless it's

Lukas Krivka•2y ago

Just be aware that request interception disables cache which makes large crawls much worse performance wise

Pepa J•2y ago

@kennysmithnanic Also you can check blockRequest method from PuppeteerCrawlerContext:

preNavigationHooks: [
    async ({ blockRequests }) => {
        await blockRequests({
            rlPatterns: [
                'yandex.ru',
                'google-analytics.com',
            ]
        });
    }
]

preNavigationHooks: [
    async ({ blockRequests }) => {
        await blockRequests({
            rlPatterns: [
                'yandex.ru',
                'google-analytics.com',
            ]
        });
    }
]

Blocking network requests with crawlee PuppeteerCrawler

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