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To capture an authenticated page, send the screenshot API a valid session cookie for the target site in the exact format that provider expects, then wait for the protected content to render and check the resulting image. A URL alone does not carry your browser’s login session. Only capture pages you are authorized to access, and treat cookies as credentials.
What you need before making the request
- Authorization: An account and an access method you are allowed to use. A screenshot service cannot infer or automatically reuse the session in your personal browser.
- A current credential: Obtain the session cookie through an authorized workflow. Depending on the site, you may need your own sign-in code to obtain it; ScreenshotOne’s guide notes that cookie acquisition can require custom code.
- The cookie’s scope: Check its domain and path against the requested page, along with its expiry and security attributes. A cookie scoped to another host or path may not be sent or accepted.
- The provider’s request format: Cookie syntax is not universal. Do not copy one service’s representation into another API.
Never put live cookie values or authorization tokens in source control, shared examples, URLs, or logs. Use the smallest-scope credential available and protect it as you would a password.
Choose the authentication method the site uses
Session cookie
Use this when the site authenticates a browser session. Cloudflare Browser Run accepts a JSON array of cookie objects; ScreenshotOne demonstrates a formatted cookie string with cookie attributes. Their representations differ, so follow the API’s own documentation: Cloudflare Browser Rendering documentation and ScreenshotOne’s authentication guide.
HTTP Basic Auth
For a page protected by Basic Auth, Cloudflare documents an authenticate object with a username and password. This is separate from the API token used to authorize the request to Cloudflare.
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Authorization or other custom headers
If the target accepts a bearer token or another header, use the header mechanism supported by both the target and screenshot service. Cloudflare documents setExtraHTTPHeaders; ScreenshotOne’s guide also demonstrates authorization and other named headers. Do not treat the screenshot provider’s API credential as the target site’s credential.
Firewall access for a site you control
ScreenshotOne describes allowing its servers through a site owner’s firewall as an option for a site the operator controls. This is an integration choice for your own infrastructure, not a way to get around another site’s login or access policy.
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Cloudflare Browser Run: send a scoped cookie
Cloudflare’s documented screenshot endpoint is https://api.cloudflare.com/client/v4/accounts/<accountId>/browser-run/screenshot. Its REST example uses a POST request with a target URL and a cookies array. Replace the placeholders with the account, API token, authorized target URL, and current cookie value; do not use an example value as a real credential.
curl -X POST "https://api.cloudflare.com/client/v4/accounts/ACCOUNT_ID/browser-run/screenshot"
-H "Authorization: Bearer CLOUDFLARE_API_TOKEN"
-H "Content-Type: application/json"
--data '{
"url": "https://example.com/protected-page",
"cookies": [
{
"name": "session_id",
"value": "YOUR_SESSION_COOKIE_VALUE",
"domain": "example.com",
"path": "/"
}
]
}'
--output protected-page.pngUse an API token with the documented Browser Rendering permission for REST access, or use Cloudflare’s documented Workers binding approach. The token in the Authorization header authorizes your call to Cloudflare; the cookie in the JSON body authenticates the browser session at the target site.
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Wait for the authenticated content to render
A successful navigation is not proof that a JavaScript application has finished loading its dashboard or report. Cloudflare notes that its default load behavior can capture before JavaScript rendering is complete. Use a wait condition suited to the page:
- Network idle: Use an appropriate
gotoOptions.waitUntilvalue such asnetworkidle0ornetworkidle2when the page’s requests settle predictably. - A content selector: Wait for a stable selector that appears only when the protected content is ready. This can avoid waiting indefinitely on persistent background requests unrelated to the content you need.
Cloudflare’s Browser Rendering documentation describes these waiting options. A combined-data workflow may also use its /snapshot endpoint, which can return rendered content and a screenshot in one call; see the Cloudflare documentation for endpoint details.
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Verify the capture, not just the request
An image response can still show a login screen, access-denied page, or incomplete application. Open the image and check that it contains the intended authenticated page. If it does not, distinguish an authentication problem from a rendering problem: a login form points first to the cookie or access method; missing app content points first to the wait condition.
Common failures and fixes
| What you see | Likely cause | What to check |
|---|---|---|
| A login form instead of the protected page | The cookie is expired, incorrect, out of scope, malformed for that API, or not accepted for automated access. | Obtain a current cookie for the correct account; verify the target host, cookie domain and path, expiry, and provider-specific cookie format. Inspect the returned image rather than treating a successful API response as proof of login. |
| A blank or partly rendered application | The capture ran before client-side rendering finished. | Wait for network idle or a selector that identifies the actual protected content. Avoid relying only on initial navigation completion. |
| The cookie appears to be ignored | The cookie object/string has the wrong shape or scope, or the site does not permit the requested automated access. | Compare the request with the screenshot provider’s cookie documentation, including domain and path. Confirm the site’s permitted integration path. |
| Access is blocked despite a changed user-agent | The site’s bot defenses still identify the browser automation request. | Do not treat a user-agent change as a bypass. Cloudflare says Browser Run requests remain identifiable as bot traffic. Use an authorized access route supported by the site. |
| Cloudflare rejects the API request | The REST token may lack the required Browser Rendering permission, or the request may not match the endpoint’s expected shape. | Check the account ID, endpoint, token permission, JSON body, and Cloudflare’s current Browser Rendering documentation. |
Or skip the browser setup
ScreenshotNeo is a website screenshot API and MCP server. For a page you are authorized to access, pass the valid session cookie in the API’s supported cookie parameter format; session-cookie syntax still depends on the target and request. Its API supports custom cookies and lets you wait for a selector, a delay, or network idle. See the ScreenshotNeo documentation for the current parameters and authentication format.
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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com/protected-page -o shot.webpCookie banners are accepted and removed before capture, along with supported newsletter popups and chat widgets; each cleanup step can be turned off. Bot checks, blank pages, failed loads, timeouts, and cache hits are not billed, and response headers report the page verdict and billing status. Its MCP server lets AI agents use take_screenshot, get_page_info, and capture_pdf. The free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. These features are on every plan. Sign up free for 1,000 screenshots a month, with no card required.
Security and access boundaries
Cookie possession grants access to the associated session, so do not share credentials casually or leave them in request logs. These techniques are for pages you own or are permitted to access. A screenshot API’s cookie, header, or user-agent options do not override the target site’s terms, access controls, or bot protections.
Quick Recap
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