request headers

Author: daisyfaithauma

src/content/docs/browser-rendering/rest-api/index.mdx

@@ -25,3 +25,18 @@ Before you begin, make sure you [create a custom API Token](/fundamentals/api/ge
 Currently, the Cloudflare dashboard displays usage metrics exclusively for the [Workers Binding API method](/browser-rendering/workers-binding-api/). Usage data for the REST API is not yet available in the dashboard. We are actively working on adding REST API usage metrics to the dashboard.
 
 :::
+
+## Automatic request headers
+
+When using the REST API to fetch content via Browser Rendering, Cloudflare adds the following headers to outbound requests made to the target URL:
+
+| Header               | Description                                                                         |
+| -------------------- | ----------------------------------------------------------------------------------- |
+| `cf-biso-request-id` | A unique identifier for the browser rendering request                               |
+| `cf-biso-devtools`   | A flag indicating the request originated from Cloudflare's rendering infrastructure |
+
+:::note[Note]
+
+These headers are unique to Browser Rendering and are automatically included and cannot be removed or overridden (such as via `setExtraHTTPHeaders`). They are intended to ensure transparency, allowing destination servers to identify traffic as coming from Cloudflare Browser Rendering.
+
+:::