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Short answer: APITemplate.io’s documented X-API-KEY header authenticates your request to its API; it does not show that arbitrary headers or cookies are forwarded to the page being rendered. The official material covered here does not document target-page header or cookie fields. Do not assume an API key, JSON property, or query parameter will authenticate you to the target website.
What the documented headers do—and do not do
There are two separate requests in this workflow: your client sends a request to APITemplate.io, and the rendering service later retrieves the target page. The documented X-API-KEY belongs to the first request. The examples in the v2 reference do not establish that it, or any other caller-supplied header, is sent to the target page.
Likewise, the examined official documentation does not specify a field for target-page cookies. That means support is unverified from these sources—not that APITemplate.io definitively has no way to set them. For a page that requires a session cookie, bearer token, or custom header, confirm the exact endpoint and accepted fields with APITemplate.io before building the workflow.
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The v2 REST reference documents POST /create-pdf-from-url with the target URL in a JSON body. This is a URL-based PDF-generation example, not proof of a screenshot endpoint or a method for passing target-page credentials. The v2 base URL shown in the reference is https://rest.apitemplate.io/v2/. See the APITemplate.io v2 REST API reference for the current endpoint details.
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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"}'Replace YOUR_API_KEY with your APITemplate.io API key and the URL with the page to render. Do not add guessed fields such as headers, cookies, or authorization to this body and treat them as supported: the cited endpoint example does not document them.
Distinguish endpoint purpose and API version
| Documentation item | What it establishes | What it does not establish |
|---|---|---|
v2 create-pdf-from-url |
URL-based PDF generation; the example places the URL in the JSON request body and authenticates with X-API-KEY. |
That the endpoint returns a screenshot image, or accepts target-page headers or cookies. |
v2 create-image |
Template-based image generation using posted overrides. | That arbitrary headers or cookies are passed to a web page being rendered. |
| Legacy v1 reference | Documents Authorization: Token [API_KEY] as an authentication alternative for that API generation. |
That this legacy syntax applies to every current v2 endpoint. |
The v1 authentication detail is from the legacy v1 reference; use the current v2 endpoint documentation for v2 requests. The getting-started guide and detailed REST reference describe regional hostnames differently, so check the current endpoint table and your account’s requirements instead of inferring a region from an older or abbreviated list.
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How to handle a page that requires login or custom request data
- Identify which request needs the credential. An API key for APITemplate.io goes in the API request’s authentication header. A website session cookie or authorization header must be applied to the renderer’s request to the target page.
- Check the exact rendering endpoint schema. Look for documented target-page header and cookie parameters for the endpoint and version you intend to call. The examples described above do not supply them.
- Ask APITemplate.io to confirm the supported path. Provide the endpoint, API version, and whether you need a cookie or header on the target-page request. Do not send production credentials until you know how the service handles them.
- Test against a non-sensitive page first. Confirm that the rendered output reflects the authenticated state, rather than assuming a successful API response means the target credentials were used.
- Protect credentials if support is confirmed. Keep API keys and session tokens out of source control and public URLs; use the vendor’s documented mechanism and rotate credentials if exposed.
Regions, limits, and operational considerations
The v2 REST reference lists Singapore as the default region, along with Frankfurt, US East (N. Virginia), and Australia. It also describes regional endpoints with different timeout and payload-size options, and says region-specific endpoints process and store generated PDFs or images within the selected region. Choose the endpoint based on the current reference and your data-residency needs.
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The same reference documents a limit of 100 requests per 10 seconds per IP and 100 concurrent synchronous PDF-generation requests per user account. It says excess requests receive HTTP 429 and suggests asynchronous generation for high-volume workloads. These are API-operation limits, not evidence of target-page cookie or header support. If APITemplate.io must retrieve geo-restricted assets, its reference also lists outbound IP addresses for whitelisting; that concerns asset access and does not configure browser-style request headers.
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Troubleshooting
- Authentication fails: Verify that the request uses
X-API-KEYfor the v2 endpoint and that the key is valid. Do not substitute the legacy v1Authorization: Tokenform unless the endpoint’s current documentation calls for it. - The API call succeeds but the page is logged out: An API authentication header only establishes your identity to APITemplate.io. Check whether the rendering endpoint explicitly supports target-page cookies or headers, then confirm the supported mechanism with the vendor.
- A guessed JSON property has no effect: Remove undocumented fields and verify the endpoint schema. The cited v2 examples do not document a target-page header or cookie property.
- You receive HTTP 429: The v2 reference identifies rate and concurrency limits and recommends asynchronous generation for high-volume workloads. Review your request rate and use the documented asynchronous approach where appropriate.
- A regional URL differs between guides: The getting-started page and detailed REST reference do not present identical regional lists. Use the current detailed endpoint table and confirm the applicable host for the account and residency requirement.
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If your actual need is a screenshot API that accepts custom headers and cookies for the page it captures, ScreenshotNeo supports those options. Its one-call request can include the target URL and API key; the API supports custom headers, cookies, and Authorization. See the ScreenshotNeo API documentation.
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-d access_key=YOUR_API_KEY
--data-urlencode url=https://example.com/page
-o shot.webpAdd the appropriate documented request options for your target-page headers or cookies. ScreenshotNeo removes cookie/consent banners, newsletter popups, and chat widgets before capture; bot checks, blank pages, and failed loads are never billed. Its MCP server lets AI agents take screenshots, and the free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for ScreenshotNeo free.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
Does APITemplate.io’s X-API-KEY authenticate me to the target website?
No. The documented header authenticates your API request to APITemplate.io; the examined v2 examples do not show it being forwarded to the rendered website.
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Can I pass a session cookie to an APITemplate.io-rendered page?
The official material covered here does not document a target-page cookie field, so support remains unverified. Confirm the exact endpoint and mechanism with APITemplate.io rather than guessing a parameter.
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