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Set Cache-Control: public, max-age=3600 on the HTTP response generated by your origin server, application, reverse proxy, or CDN. Headless Chrome cannot add or change that origin response header. It can only receive the header and let you inspect it through the Chrome DevTools Protocol (CDP), Puppeteer, or the DevTools Network panel.
The max-age value is measured in seconds from response generation. An intermediary’s Age value reduces the remaining freshness lifetime. Configure the response where it is emitted, then verify the exact response Chrome receives.
Where Cache-Control is actually configured
Cache-Control is an HTTP response header. The component that serves the resource must emit it. Depending on your deployment, that component is:
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- a web server such as a reverse proxy;
- a CDN or edge configuration; or
- another service that generates the response.
For an hour of freshness, the response should contain:
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Cache-Control: public, max-age=3600max-age=3600 means a shared cache may regard the response as fresh for 3,600 seconds after it was generated. Use a different number when your content changes more or less frequently. If the response is user-specific, use an appropriate private policy instead of copying a public policy.
Check the resource, not only the document
A page request, stylesheet, image, API response, and script can each have different cache headers. Decide which URL needs the policy and inspect that URL’s response. Setting a header on your HTML document does not automatically set it on every subresource.
Choose the policy before testing Chrome
| Directive | Meaning | Typical use |
|---|---|---|
max-age=N |
Fresh for N seconds after generation | Any response with a defined freshness period |
public, max-age=N |
Allows shared caches to store the response while it is fresh | Public, identical content |
private, max-age=N |
Allows a private browser cache but signals that shared caches should not store it | User-specific responses |
Use seconds, not minutes or milliseconds. For example, one day is 86400 seconds. The freshness clock starts with response generation; an intermediary that sends an Age header can make the remaining freshness period shorter when Chrome receives the response.
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Set the header in the component that serves the response
Application response
In an application route, set the response header before sending the body. The exact API depends on your framework, but the result must be an HTTP response line equivalent to:
Cache-Control: public, max-age=3600Confirm that no later middleware, reverse proxy, or CDN rule overwrites it. A header shown in application code is not proof that it reached the client; the wire response is authoritative.
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Reverse proxy or web server
If a proxy serves static files or adds headers, configure its response-header rule for the relevant location. Keep the rule narrow enough that private endpoints do not inherit a public policy. Reload the proxy after changing configuration, then request the URL directly and inspect the response.
CDN or edge layer
A CDN can replace or add cache directives at the edge. Determine whether the browser is seeing the origin header or an edge-generated one. Purge an old object, if your CDN requires that for configuration changes, and verify a fresh response. Otherwise a previously stored object can continue to show the old policy.
Verify the header in headless Chrome
- Launch Chromium with remote debugging enabled, for example
--headless --remote-debugging-port=9222. - Connect Puppeteer, another automation library, or a direct CDP client.
- Enable the Network domain when using CDP directly.
- Navigate to the target URL and capture the response for the exact resource you changed.
- Read the received
cache-controlvalue and compare it with the expectedmax-age.
Puppeteer verification
This script logs the response header for the document URL. It observes what Chrome received; it does not create the server header.
const puppeteer = require('puppeteer');
const targetUrl = 'https://example.com/';
(async () => {
const browser = await puppeteer.launch({ headless: true });
const page = await browser.newPage();
page.on('response', response => {
if (response.url() === targetUrl) {
console.log({
status: response.status(),
cacheControl: response.headers()['cache-control'],
fromCache: response.fromCache(),
fromServiceWorker: response.fromServiceWorker()
});
}
});
await page.goto(targetUrl, { waitUntil: 'networkidle0' });
await browser.close();
})();For a page that redirects, the final response URL may differ from targetUrl. Log every response, or compare against the final URL, when diagnosing redirects. To inspect an image, stylesheet, or API call, match that resource URL instead of the document URL.
CDP concepts
The CDP Network domain provides request and response instrumentation. A direct client should enable Network before navigation, listen for response events, and inspect the response headers in each event. The important distinction is that CDP exposes the header Chrome received; it cannot rewrite the origin’s response.
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DevTools Network panel
In a headed debugging session, open the Network panel, reload the page, select the request, and view the Headers tab. Searching for Cache-Control takes you to the matching header. The same response may also show whether it came from memory or disk cache, which is useful when interpreting a reload.
Do not confuse cache bypass with setting max-age
The CDP method Network.setCacheDisabled is a diagnostic switch. When enabled, Chrome ignores its cache for requests. The DevTools Network-panel Disable cache checkbox has the same testing purpose while DevTools is open. Neither control adds, edits, or persists a Cache-Control response header.
Use cache bypass when you need to test a fresh network response. Turn it off when you need to observe normal cache behavior. Always verify the server policy separately.
Understand reload, freshness, and revalidation
A normal navigation can reuse a fresh cached response without contacting the origin. When the freshness lifetime expires, Chrome can make a conditional request using validators such as ETag or Last-Modified. A conditional response can be 304 Not Modified rather than a full body.
Chrome’s refresh behavior can send a request directive with max-age=0, asking caches to revalidate. Therefore, a refresh that reaches the server does not prove that your response was never cached, and a reload that appears instant does not prove that the origin header is missing. Inspect request and response headers and the cache-status indicators together.
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Troubleshooting common failures
The header is absent
- Cause: You changed a component that does not serve the requested resource.
- Fix: Inspect the response URL in Chrome, then configure the application, proxy, or CDN layer that actually emitted it.
The value is different from your configuration
- Cause: A later middleware or edge rule overwrote the header, or Chrome received an older cached object.
- Fix: Compare the origin response with the client response, purge or bypass the relevant cache for testing, and locate the last component that changes the header.
Chrome appears to ignore max-age
- Cause: The response is stale, a refresh requested revalidation, the request is bypassing cache, or the resource is controlled by a service worker.
- Fix: Check request directives, response headers, cache source indicators, and service-worker status. Test once with cache bypass and once with normal caching.
Only some assets cache
- Cause: Different resources are generated by different handlers or have different policies.
- Fix: Capture and inspect each resource type separately; do not infer an image or API policy from the HTML document.
The script logs nothing
- Cause: The URL comparison missed a redirect, query-string variation, or trailing slash.
- Fix: Log all response URLs first, then match the final URL or use a URL parser rather than a literal string comparison.
Operational guidance
Pick a lifetime that matches change frequency
Longer lifetimes reduce repeated transfers but delay visible updates until expiry or an explicit revalidation. Shorter lifetimes make updates appear sooner while increasing origin or intermediary checks. For versioned assets, a long lifetime is safer because changing the filename creates a new URL; for unversioned HTML or APIs, choose a period that matches how quickly clients must see changes.
Verify through every caching layer
Test the origin directly when possible, then test the public URL through the CDN or reverse proxy. Record Cache-Control, any Age value, status code, validators, and whether the response came from memory, disk, a service worker, or the network. This prevents a browser-only observation from hiding an edge configuration problem.
Use repeatable automation
Run the same headless check after deployments. Assert that the expected directive is present, but allow for redirects and resources whose policy is intentionally different. A failed assertion should identify the response URL and the complete received header so the faulty layer is clear.
Or skip the browser setup
If your goal is a clean visual capture while you diagnose or document a page, ScreenshotNeo can take the screenshot through one request. It is separate from configuring your origin’s Cache-Control header, but it avoids maintaining a browser-capture stack.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchScreenshotNeo removes cookie-consent banners, newsletter popups, and chat widgets before capture. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and each response identifies the page verdict and billing status in X-Page-Verdict and X-Billed headers. Its MCP server provides take_screenshot, get_page_info, and capture_pdf tools for Claude, Cursor, and other MCP clients. The Free plan includes 1,000 screenshots per month without a card; paid plans start at $5 for 3,000 screenshots. Every plan includes all features.
Use the ScreenshotNeo documentation for options such as full-page capture, CSS-selector element capture, device and retina settings, custom headers and cookies, waiting conditions, request blocking, PDF output, signed links, asynchronous jobs, and bulk capture.
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Frequently Asked Questions
Does setting a request header in Puppeteer set the response Cache-Control header?
No. Request headers travel from Chrome to the server. Cache-Control max-age in this context must be emitted by the server in its response.
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It represents time an intermediary has held the response, so the remaining freshness period can be less than the original max-age value.
Can a 304 response contain the original response body?
No. A 304 tells the cache that its stored representation can be reused; inspect the stored response’s cache policy and validators.
Quick Recap
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