Puppeteer can stop a page request before it downloads, let it continue unchanged, or replace it with your own response. Enable interception with await page.setRequestInterception(true), then resolve every intercepted request with request.abort(), request.continue(), or request.respond(). The important constraint is that interception stalls requests until one of those outcomes is chosen (or the browser serves the request from cache).
This guide shows a safe blocking pattern, ad and tracker rule design, multi-handler coordination, experimental URL blocklists, troubleshooting, and an API alternative when you do not want to maintain a browser worker.
Enable interception before navigation
Turn interception on before opening the target URL so the initial document and its subresources pass through your handler.
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch({headless: true});
const page = await browser.newPage();
await page.setRequestInterception(true);
page.on('request', request => {
return request.continue();
});
await page.goto('https://example.com', {waitUntil: 'networkidle2'});
await page.screenshot({path: 'page.png', fullPage: true});
await browser.close();
})();Every request event must reach a terminal decision. If a handler neither continues, aborts, nor responds, page activity can hang indefinitely. Register the handler before goto, and keep the default path explicit even when you are only blocking a few hosts.
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Block a host, URL, or resource type
Block by hostname or URL fragment
A rule can inspect request.url() and abort matching traffic. The hostname test below is illustrative; replace it with domains you have verified for your own target sites. Puppeteer does not publish a canonical ad or tracker taxonomy.
const blockedHosts = new Set([
'example-tracker-domain.test',
'ads.example.test'
]);
await page.setRequestInterception(true);
page.on('request', request => {
const url = new URL(request.url());
if (blockedHosts.has(url.hostname)) {
return request.abort();
}
return request.continue();
});Use an exact hostname set when you know the infrastructure. For controlled test environments, a suffix rule can cover subdomains:
const blockedSuffixes = ['.doubleclick.example', '.telemetry.example'];
page.on('request', request => {
const hostname = new URL(request.url()).hostname;
const shouldBlock = blockedSuffixes.some(suffix => hostname.endsWith(suffix));
return shouldBlock ? request.abort() : request.continue();
});Do not use a broad substring such as ads without checking false positives. A legitimate application endpoint can contain the same text.
Block images, fonts, or other resource classes
The request object exposes the resource type. This is useful for reducing bandwidth, but it can break layouts or functionality when images, fonts, stylesheets, or scripts are required.
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const blockedTypes = new Set(['image', 'media']);
page.on('request', request => {
if (blockedTypes.has(request.resourceType())) {
return request.abort();
}
return request.continue();
});A safer production policy is usually host plus type: block third-party media from known hosts while allowing first-party assets.
Return a synthetic response
request.respond() fulfills a request without contacting its origin. This is useful for deterministic tests.
page.on('request', request => {
if (request.url().endsWith('/feature-flags.json')) {
return request.respond({
status: 200,
contentType: 'application/json',
body: JSON.stringify({newCheckout: false})
});
}
return request.continue();
});Only provide response fields your test needs. A malformed body or mismatched content type can produce application errors that look like page failures.
Build rules that do not break the page
Start with observation
Before aborting anything, log requests and classify them by hostname, resource type, and whether they are first- or third-party. Capture a representative set of routes, including login, checkout, consent, and error pages. Then block one rule at a time and verify the resulting DOM and network behavior.
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const url = new URL(request.url());
console.log(request.resourceType(), url.hostname, url.pathname);
return request.continue();
});Keep rules in configuration rather than scattering string tests through handlers. Record why each domain is blocked and an owner or review date so stale vendor domains can be removed.
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Choose abort errors deliberately
request.abort() can take an error code. The default is generally sufficient for ad and tracker suppression. If your application distinguishes offline, refused, or blocked traffic, choose the code deliberately and test how the page handles it.
Remember service workers and cached responses
Interception applies to requests surfaced through Puppeteer, but a page can satisfy work from service-worker or browser caches. The interception documentation notes that requests can complete from browser cache; do not assume every resource generates a fresh network decision. For reproducible tests, use a clean context and control service-worker state where appropriate.
Coordinate multiple request handlers
Libraries and application code can both register request listeners. Two listeners may attempt to resolve the same request. Before resolving, check request.isInterceptResolutionHandled(). If you await asynchronous work, check again immediately after the await; another handler may have won while your code was paused.
page.on('request', async request => {
if (request.isInterceptResolutionHandled()) return;
const blocked = request.url().includes('example-tracker-domain.test');
if (blocked) {
if (request.isInterceptResolutionHandled()) return;
return request.abort();
}
if (request.isInterceptResolutionHandled()) return;
return request.continue();
});The check and the resolution call should be adjacent and synchronous. A check performed much earlier is not a lock.
Use cooperative priorities only when all handlers support them
Puppeteer’s Cooperative Intercept Mode lets handlers provide a numeric priority to abort, continue, or respond. Puppeteer waits for handlers, then selects the highest-priority decision. If priorities tie, the documented order is abort, respond, then continue.
const {DEFAULT_INTERCEPT_RESOLUTION_PRIORITY} = puppeteer;
page.on('request', request => {
if (request.isInterceptResolutionHandled()) return;
if (request.url().includes('example-tracker-domain.test')) {
return request.abort('blockedbyclient', 10);
}
return request.continue({}, DEFAULT_INTERCEPT_RESOLUTION_PRIORITY);
});A handler that omits a priority uses legacy immediate resolution and changes the coordination model. Do not add priorities casually; first inspect every listener installed by your application and its dependencies. A default continuation at priority zero can leave room for a higher-priority decision, but only in a consistently cooperative setup.
Experimental URL blocklists and allowlists
Puppeteer’s ConnectOptions reference documents experimental blocklist and allowlist options based on the standard URLPattern API. The current reference describes these options as Chrome-only. A matching blocklist pattern causes matching navigations and subresource requests to fail.
These options operate at browser attachment rather than in a page event handler. Verify your installed Puppeteer version and browser before relying on them, because the documentation snapshot identifies the feature as experimental.
An allowlist is not a complete network sandbox. Chrome can reach the network through paths or features that bypass the network service. For isolation boundaries, use container- or operating-system-level controls. Use an allowlist to constrain application behavior, not as a security guarantee against a hostile page.
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Complete example: blocking known third-party traffic
This runnable script combines host and resource-type rules, logs decisions, waits for a stable page, and writes a screenshot.
const puppeteer = require('puppeteer');
(async () => {
const browser = await puppeteer.launch({headless: true});
const page = await browser.newPage();
const blockedHosts = new Set([
'ads.example.test',
'metrics.example.test'
]);
const blockedTypes = new Set(['media']);
await page.setRequestInterception(true);
page.on('request', request => {
if (request.isInterceptResolutionHandled()) return;
let hostname;
try {
hostname = new URL(request.url()).hostname;
} catch {
return request.continue();
}
if (blockedHosts.has(hostname) || blockedTypes.has(request.resourceType())) {
console.log('ABORT', request.resourceType(), request.url());
return request.abort();
}
console.log('ALLOW', request.resourceType(), request.url());
return request.continue();
});
try {
await page.goto('https://example.com', {
waitUntil: 'networkidle2',
timeout: 60000
});
await page.screenshot({path: 'clean.png', fullPage: true});
} finally {
await browser.close();
}
})();Replace the example domains with rules validated against your site. Keep the timeout finite, and always close the browser in a finally block so failed navigations do not leak Chromium processes.
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The page hangs after interception is enabled
Most often, a handler returned without calling continue, abort, or respond. Add a default continuation and log every branch. Also check for a second handler that resolved the request first.
“Request is already handled” or duplicate-resolution errors
Multiple listeners raced. Guard every listener with isInterceptResolutionHandled(), and repeat the guard after each asynchronous operation. Alternatively, consolidate policy into one handler.
Blocking ads removes application features
The domain may host both advertising and required APIs, or your resource-type rule may be too broad. Narrow the match to an exact hostname and path, allow first-party traffic, and test navigation, forms, and authentication separately.
The tracker still appears in logs
A page may use a different hostname, a redirect, a service worker, or cached content. Log the complete URL and resource type, inspect redirects, and test with a fresh browser context. Update the rule only after confirming the actual request.
An allowlist does not stop all outbound traffic
That behavior is expected: the documented allowlist is not a full sandbox. Enforce isolation outside Puppeteer with container or OS networking controls.
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Interception adds JavaScript work for every surfaced request. Keep matching operations simple (sets and precompiled patterns), avoid network calls inside the handler, and avoid awaiting asynchronous policy unless you need it. Broad logging can become the bottleneck on pages with many resources, so make verbose logs configurable.
Blocking third-party scripts can improve load time, but aborting fonts, CSS, or images may cause layout shifts and change screenshots. Measure the page state you actually care about: a visual baseline, a functional test, or a reduced-bandwidth crawl. Use explicit navigation and selector waits when network-idle never occurs because analytics or long polling remains active.
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Request interception runs inside each browser process you operate. Your cost and capacity therefore include Chromium memory, startup time, concurrency limits, proxy or egress charges, and maintenance of domain rules. If your goal is simply a clean screenshot, an API can remove that browser operational burden.
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ScreenshotNeo is a website screenshot API and MCP server. It accepts consent banners before capture, removes more than 60 known consent platforms plus newsletter popups and chat widgets, and lets you turn each cleanup step off. Only clean shots are billed: bot checks or CAPTCHAs, blank pages, timeouts, failed loads, and cache hits cost nothing, with the result identified by X-Page-Verdict and X-Billed headers.
One GET request returns PNG, JPEG, WebP, or PDF. The API also supports blocking ads, trackers, requests, or resource types; custom CSS and JavaScript; selector waits; cookies and headers; device and viewport settings; full-page and element captures; caching; bulk jobs; and signed webhooks. Its MCP server exposes take_screenshot, get_page_info, and capture_pdf to Claude, Cursor, and other MCP clients.
See the ScreenshotNeo API documentation for authentication and all options. The following calls use the supplied API format.
cURL
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webpPython
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
r.raise_for_status()
open("shot.webp", "wb").write(r.content)Node.js
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
if (!res.ok) throw new Error(`Screenshot failed: ${res.status}`);
const fs = await import('node:fs/promises');
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Does interception block requests made before the handler is registered?
No. Enable interception and register the listener before navigation or any action that triggers the traffic you want to control.
Can Puppeteer identify every ad or tracker automatically?
No. The API supplies request data and control methods, but you must create and maintain rules for the domains, paths, or resource types relevant to your targets.
Should I use an allowlist for security isolation?
No. The documented allowlist is experimental, Chrome-only, and explicitly not a complete network sandbox. Use OS- or container-level isolation for that requirement.
Frequently Asked Questions
Can interception affect screenshots?
Yes. Blocking CSS, fonts, images, or scripts can change layout and rendering. Validate visual output after each rule change.
What is the safest default handler?
Continue every request unless a narrowly tested rule matches; always guard against another handler resolving it first.
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