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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →To test X-Frame-Options, inspect the actual HTTP response headers for the page: run curl -sS -D - -o /dev/null -L https://example.com, then look for X-Frame-Options and Content-Security-Policy. DENY blocks framing, while SAMEORIGIN permits framing only by pages from the same origin. A missing X-Frame-Options header does not automatically mean that framing is allowed, because CSP frame-ancestors may enforce the policy instead.
What an X-Frame-Options test actually proves
X-Frame-Options is an HTTP response header that tells a browser whether it should render a document in a frame, iframe, embed or object. The reliable test is therefore a header inspection of the response returned for the URL you care about—not a search of the HTML source and not a check of a web-server configuration file alone.
A successful observation establishes the policy on that particular response. It does not prove that every route, redirect destination, error page, environment or browser path sends the same policy. Test the authenticated and unauthenticated routes that matter, and record the final URL and status code.
Run the fastest command-line test
Inspect the final response after redirects
curl -sS -D - -o /dev/null -L https://example.com-D - prints response headers, -o /dev/null discards the page body, and -L follows redirects. In the output, find the final response block and check for:
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X-Frame-Options: DENYX-Frame-Options: SAMEORIGIN- an obsolete
X-Frame-Options: ALLOW-FROM ...value Content-Security-Policy: frame-ancestors ...
When redirects are important evidence, remove -L and inspect each hop separately:
curl -sS -D - -o /dev/null https://example.comA redirect response can be generated by a CDN, load balancer or authentication layer, while the final document is generated by the application. Do not mistake a header on the redirect for a policy on the destination document.
Use a GET request when HEAD may differ
Some systems construct HEAD responses differently from GET responses. To inspect the response that a browser is more likely to receive, use a GET while still discarding the body:
curl -sS -D - -o /dev/null -L -X GET https://example.comCompare the result with your browser’s Network panel if a proxy, cache or authentication gateway is involved.
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Check the header in browser developer tools
- Open the page in a desktop browser.
- Open Developer Tools and select the Network panel.
- Reload the page with the Network panel open.
- Select the document request, usually the request whose type is document.
- In Headers, read Response Headers and locate
X-Frame-OptionsandContent-Security-Policy. - Repeat the check after a login if the protected page is the one you need to assess.
Check the document request rather than an image, script or stylesheet. Also inspect failed responses and error pages: a 403 or 500 response may come from a different infrastructure layer and may not carry the same policy as the normal page.
Interpret every X-Frame-Options value correctly
| Response value | Meaning | Practical conclusion |
|---|---|---|
DENY |
The document should not be rendered in any frame, whether the parent is same-origin or cross-origin. | Strong, coarse-grained framing restriction. |
SAMEORIGIN |
Framing is allowed only when the relevant ancestor frames have the same origin as the document. | Suitable when the application genuinely embeds its own pages. |
ALLOW-FROM ... |
Obsolete syntax that modern browsers may ignore. | Do not rely on it for a modern allowlist; use CSP frame-ancestors. |
| No X-Frame-Options header | No X-Frame-Options policy was observed on that response. | Continue by checking CSP frame-ancestors; absence alone does not prove unrestricted framing. |
The header must be delivered as an HTTP response header. Adding <meta http-equiv='X-Frame-Options'> to a page does not enforce the policy; browsers do not apply X-Frame-Options from a meta element.
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Check CSP frame-ancestors as well
Content Security Policy’s frame-ancestors directive provides finer control than X-Frame-Options. It can name the parent sources that may embed a document, and frame-ancestors 'none' is broadly equivalent to X-Frame-Options: DENY. The directive evaluates each ancestor, which matters when frames are nested.
Read the complete CSP response header, not just a report-only policy. A policy in Content-Security-Policy-Report-Only reports violations but does not enforce them.
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Examples
Content-Security-Policy: frame-ancestors 'none'This blocks all listed framing relationships in supporting browsers.
Content-Security-Policy: frame-ancestors https://portal.example https://admin.exampleThis permits only the specified parent origins. Use this approach when a controlled set of other sites must embed the page.
Automate the check
cURL with a compact verdict
url='https://example.com'
headers=$(curl -sS -D - -o /dev/null -L "$url")
printf '%sn' "$headers" | grep -iE '^(HTTP/|x-frame-options:|content-security-policy:)'This prints status lines and the two relevant policy headers. Keep the complete output when you need an audit record, because duplicate responses and redirect hops can explain an apparent inconsistency.
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Python
import requests
url = 'https://example.com'
response = requests.get(url, allow_redirects=True, timeout=30)
print('status:', response.status_code)
print('final URL:', response.url)
print('X-Frame-Options:', response.headers.get('X-Frame-Options'))
print('Content-Security-Policy:', response.headers.get('Content-Security-Policy'))
print('redirects:', [r.status_code for r in response.history])The request follows redirects and prints the policy on the final response. For a protected route, provide the appropriate session cookies through requests.Session() rather than assuming an unauthenticated response represents the application.
Node.js
const url = 'https://example.com';
const res = await fetch(url, { redirect: 'follow' });
console.log('status:', res.status);
console.log('final URL:', res.url);
console.log('X-Frame-Options:', res.headers.get('x-frame-options'));
console.log('Content-Security-Policy:', res.headers.get('content-security-policy'));Run this with a Node.js version that provides the standard fetch implementation. If your application requires login cookies or custom authorization, add them to the request headers and protect those credentials from appearing in logs.
Test the routes and layers that matter
- Homepage and sensitive pages: test account, payment, administration and workflow pages, not only the marketing homepage.
- Authenticated and unauthenticated states: middleware may add headers only after login, or an identity provider may generate a different response.
- Redirect destinations: inspect every hop and the final document.
- Success and error responses: verify representative 4xx and 5xx pages if they can be framed or displayed by another site.
- Every deployment: staging, production and alternate hostnames can have different CDN or reverse-proxy rules.
- Different protocols and ports: origin matching includes scheme, host and port; do not treat two hostnames as same-origin merely because they share a parent domain.
Header duplication is also worth investigating. If multiple infrastructure layers append different X-Frame-Options values, do not choose the most favorable line and declare success; determine which value the target browser enforces and remove the configuration conflict.
Use a controlled iframe check as a secondary test
A header inspection is the primary test. A browser behavior check can confirm what a real client does for one route, but it is not a replacement for reviewing the response.
- Create a local HTML file containing an iframe whose
srcis the page under test. - Serve that file from a local HTTP server rather than opening it as a
file://URL. - Open the wrapper in a browser and watch the Console and Network panels.
- Compare the result with the response policy and the browser version you need to support.
<!doctype html>
<html lang='en'>
<body>
<iframe src='https://example.com' title='framing test' width='800' height='600'></iframe>
</body>
</html>A refused frame, console message or blocked document is useful corroboration. A page that appears to load in one browser does not prove that all clients, routes or ancestors are permitted; nested frames and CSP processing can change the result.
Common failures and fixes
“The header is missing”
First confirm that you selected the document response, followed the right redirect, and used the correct hostname. Then inspect CSP frame-ancestors. A site can have effective framing protection without X-Frame-Options.
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You found the value in page source
Page source shows HTML, not the authoritative response metadata. Re-run the check in the Network panel or with cURL and look at response headers.
Only the redirect has X-Frame-Options
Inspect the final document response. Configure the policy where the page is generated or at the response layer that consistently covers the destination.
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Compare CDN, proxy and application responses, including status code, final URL and all policy headers. Environment-specific middleware and cache rules commonly explain the difference.
ALLOW-FROM appears to work
Do not treat that observation as modern support. The directive is obsolete and modern browsers may ignore it. Replace an intended parent allowlist with CSP frame-ancestors, then test the browsers relevant to your audience.
A CSP report says “blocked,” but the page still frames
Check whether the policy is report-only. Enforcement requires the Content-Security-Policy response header, not only Content-Security-Policy-Report-Only.
Performance, reliability and evidence notes
Header checks are lightweight, but reliability depends on testing the same request path a user takes. HEAD and GET can differ, caches can serve an older response, and a bot challenge or authentication redirect can replace the application page. Save the command, URL, timestamp, status code, final URL, redirect chain and complete relevant headers with your finding.
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Clickjacking defense is centered on restricting who may embed a document. SameSite cookies can provide an additional, partial mitigation, but they do not replace an explicit framing policy. Treat X-Frame-Options as one control in a broader assessment, not as proof that an application is secure against every clickjacking scenario.
Or skip the browser setup
If you also need a clean visual capture of the page or an iframe test fixture, ScreenshotNeo provides a one-request screenshot API. It does not replace raw-header inspection—the response you receive is an image or PDF rather than the site’s HTTP headers—but it can automate the capture step after you have decided which URL and state to examine.
For example, capture a page with cURL (see the ScreenshotNeo documentation for all parameters):
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); 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}`);- Cookie banners, newsletter popups and chat widgets are removed before the shot; each cleanup step can be disabled.
- Bot checks or CAPTCHAs, blank pages, timeouts, failed loads and cache hits are not billed, and response headers identify the page verdict and billing result.
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Frequently Asked Questions
What should I save as evidence for an X-Frame-Options finding?
Save the exact URL, request method, timestamp, status code, final URL after redirects, complete X-Frame-Options and CSP response headers, and the browser or command used. This lets another person reproduce the observation and identify a proxy or cache difference.
Can a header test cover an entire website?
No. A result applies to the response you tested. Verify representative routes, authentication states, redirects, error responses and each deployment environment before describing coverage for the site as a whole.
Quick Recap
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