[BRAPI] request headers (#22043)

* request headers

* edits

* Update automatic-request-headers.mdx

Author: daisyfaithauma

src/content/docs/browser-rendering/reference/automatic-request-headers.mdx

@@ -0,0 +1,19 @@
+---
+pcx_content_type: reference
+title: Automatic request headers
+sidebar:
+  order: 2
+---
+
+When using the [REST API](/browser-rendering/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.
+
+:::

src/content/docs/browser-rendering/reference/index.mdx

@@ -0,0 +1,12 @@
+---
+pcx_content_type: reference
+title: Reference
+sidebar:
+  order: 7
+  group:
+    hideIndex: true
+---
+
+import { DirectoryListing } from "~/components";
+
+<DirectoryListing />

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

@@ -2,7 +2,7 @@
 pcx_content_type: navigation
 title: REST API
 sidebar:
-  order: 3
+  order: 2
 ---
 
 The REST API is a RESTful interface that provides endpoints for common browser actions such as capturing screenshots, extracting HTML content, generating PDFs, and more.