Call response.headers() on Puppeteer’s HTTPResponse object. It returns an object whose header-name keys are lowercase, so use headers['content-type'], not headers['Content-Type'].
Read headers from a page navigation
page.goto() returns the navigation response when one exists. Check that it is not null before calling headers():
const response = await page.goto('https://example.com');
if (response) {
const headers = response.headers();
console.log(headers['content-type']);
console.log(headers);
}headers() returns a Record<string, string>. All header-name keys are lowercase. The official HTTPResponse.headers() reference is labeled Puppeteer 25.9.0.
Handle a navigation triggered by an action
When a click or other action causes navigation, wait for the navigation and perform the action together. This avoids a timing race in which the code tries to read the response before navigation completes:
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const [response] = await Promise.all([
page.waitForNavigation(),
page.click('a.next'),
]);
const headers = response?.headers();
console.log(headers?.['content-type']);The optional chaining handles a possible null navigation response. Puppeteer documents page.goto() returning null in cases such as navigating to about:blank or changing only the hash on the same URL. See the Page reference.
Inspect responses beyond the main page
To see headers for requests made by the page—such as an API call or an image request—listen for the page’s response event. Each event supplies an HTTPResponse:
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page.on('response', response => {
console.log(response.url(), response.status(), response.headers());
});The callback runs for responses as they arrive. Filter by URL or status if you only need a particular request:
page.on('response', response => {
if (response.url().includes('/api/')) {
console.log(response.status());
console.log(response.headers());
}
});The HTTPResponse class reference documents url(), status(), headers(), and related response methods. Its page is labeled Puppeteer 25.12.0; check the documentation matching your installed version when exact behavior matters.
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Understand casing and repeated header values
- Use lowercase keys such as
content-typeandcache-control; do not rely on the original capitalization sent by the server. - When a response contains duplicate header values, Puppeteer combines them into a comma-separated value, except
Set-Cookie, which is separated with a newline. Do not assume every repeated value remains independently addressable in the returned object.
Do not confuse response headers with request headers
| Goal | Puppeteer API | What it does |
|---|---|---|
| Read headers received from a server | response.headers() |
Returns headers on an HTTPResponse. |
| Read headers associated with an outgoing request | request.headers() |
Returns headers on an HTTPRequest; it is not the response-header API. See the HTTPRequest.headers() reference. |
| Set extra headers for page requests | page.setExtraHTTPHeaders({...}) |
Configures headers sent with requests initiated by that page. Names are lowercased and header order is not guaranteed. See the Page.setExtraHTTPHeaders() reference. |
Use related response methods when needed
headers() is for headers. The same response object also provides status() for the HTTP status code, ok() for whether the response is successful (2xx), url() for its URL, and request() for the associated request. These are useful when diagnosing a response, but they do not replace headers() for reading response headers.
Troubleshoot missing or unexpected headers
responseis null: Guard the return value frompage.goto()orwaitForNavigation(). Some navigations, includingabout:blankand same-URL hash changes, have no navigation response.- A header lookup returns
undefined: Use the lowercase key, for exampleheaders['content-type']. Also check whether the particular response actually contains that header. - You see fewer entries than expected: Repeated values may be combined; ordinary duplicates are comma-separated and
Set-Cookievalues are newline-separated. - You are seeing outgoing values instead: Check that you are calling
headers()on anHTTPResponse, not anHTTPRequest, and that you have not mistakensetExtraHTTPHeaders()for a read operation. - You need headers from a subrequest: Listen for the page’s
responseevent rather than relying only on the return value from the main navigation.
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- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
- Transfer Files in Seconds: Move files to and from your laptop at speeds of up to 5 Gbps via the USB-C and USB-A data ports. Note: The USB C 5Gbps Data port does not support video output.
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- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
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