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Freedom251 › Blog › API headers

How to Add Custom Headers and Cookies to APITemplate.io Screenshot Requests

By Freedom251 Team · · 4 min read

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Short answer: APITemplate.io’s documented v2 API uses X-API-KEY to authenticate your request to APITemplate.io. The official documentation covered here does not establish a field or parameter for sending custom headers or cookies to the page being rendered. Do not assume the API key header is forwarded to that page, or invent a request field; confirm the target endpoint’s accepted options with APITemplate.io before relying on authenticated-page capture.

Two different requests: API authentication and page rendering

A screenshot or PDF workflow can involve two separate HTTP requests: your client calls APITemplate.io, then its rendering service retrieves the target page. The documented X-API-KEY header authenticates the first request. It does not, by itself, demonstrate that APITemplate.io sends that header to the website being rendered.

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The official documentation examined does not show a target-page header or cookie option for the URL-based PDF endpoint. That means support is unverified from these sources—not that no endpoint or support path exists. Check the exact endpoint schema or ask APITemplate.io support before building around custom target headers or session cookies.

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What the documented v2 endpoints do

The v2 reference distinguishes template-based image generation from PDF generation from a URL. The examples establish the endpoints’ purposes and API authentication, but do not establish target-page header or cookie forwarding.

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  • POST /create-pdf-from-url accepts a URL in a JSON request body and is documented for URL-based PDF generation.
  • create-image is template-based and accepts overrides; it is not evidence of a general URL screenshot endpoint.

Because the title’s use of “screenshot” does not identify a documented endpoint, first verify which endpoint and output format your account supports for the job you need.

Documented v2 request example

This is the documented pattern for requesting a PDF from a URL. It authenticates to APITemplate.io; it is not a verified screenshot endpoint or a demonstrated way to pass cookies or headers to the target page.

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curl -X POST "https://rest.apitemplate.io/v2/create-pdf-from-url" 
  -H "X-API-KEY: YOUR_API_KEY" 
  -H "Content-Type: application/json" 
  -d '{"url":"https://example.com/page"}'

See the ScreenshotNeo API documentation for the separate one-call alternative below. For APITemplate.io, confirm the precise endpoint and accepted request fields before adding any presumed header or cookie key.

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Authentication headers by API generation

The current v2 reference documents X-API-KEY: YOUR_API_KEY. The older v1 reference also documents Authorization: Token [API_KEY] as an alternative for that API generation. Do not carry the legacy syntax over to v2 unless the endpoint documentation for your account says to do so.

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Regional endpoints, limits, and operational planning

The v2 REST reference lists Singapore as the default region, as well as Frankfurt, US East (N. Virginia), and Australia. The getting-started guide describes its v2 choices as US/default, EU, Australia, and Singapore, so the naming differs between the two official pages. Check the current endpoint table and account requirements for your region and data-residency needs rather than assuming these labels map one-to-one.

The v2 reference documents a limit of 100 requests per 10 seconds per IP and 100 concurrent synchronous PDF-generation requests per user account. Requests over the limits receive HTTP 429; the reference suggests asynchronous generation for high-volume workloads. It also lists region-specific endpoints and outbound IP addresses for cases where APITemplate.io must retrieve geo-restricted assets. Those details concern request handling and asset access, not proof of custom browser headers or cookies.

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Troubleshooting authenticated-page capture

  • The target page is logged out: Your API key authenticates your call to APITemplate.io, not necessarily the browser request to the site. Verify whether the exact rendering endpoint supports target cookies or headers.
  • The API rejects the request: Confirm that you are using the correct v2 endpoint, the documented X-API-KEY header, and JSON content type for a JSON request body. Do not use the v1 Authorization: Token form by assumption.
  • You receive HTTP 429: The v2 reference identifies rate-limit excess as the cause. Reduce request rate or use asynchronous generation for high-volume work.
  • Geo-restricted assets do not load: Check the region-specific endpoint and the reference’s outbound-IP whitelist information with your network or site operator. This does not supply a method for setting target-page cookies.
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Or skip the browser setup

If your requirement is to capture a URL and control page cookies or headers, ScreenshotNeo is a screenshot API with explicit options for custom headers and cookies. A GET request returns an image or PDF; for example, this cURL request captures a URL as WebP:

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curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://example.com/page -o shot.webp

ScreenshotNeo removes cookie/consent banners, newsletter popups, and chat widgets before capture, with each cleanup step optional. Bot checks, blank pages, timeouts, failed loads, and cache hits cost nothing; response headers identify the page verdict and billing status. An MCP server offers take_screenshot, get_page_info, and capture_pdf tools for AI agents. The Free plan includes 1,000 shots per month with no card; paid plans start at $5 for 3,000 shots. Sign up for 1,000 free screenshots a month, with no card required.

Frequently Asked Questions

Does APITemplate.io’s X-API-KEY authenticate the target website?

No such forwarding behavior is established by the documented examples. The header authenticates the API request to APITemplate.io.

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Can I pass a session cookie to the page APITemplate.io renders?

The official documentation examined here does not specify a target-page cookie option. Confirm support and syntax for the exact endpoint with APITemplate.io.

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