[Rules] New Snippets example: Change origin and modify paths (#18799)

---------

Co-authored-by: Pedro Sousa <[email protected]>

src/content/docs/rules/snippets/examples/route-and-rewrite.mdx

@@ -0,0 +1,54 @@
+---
+type: example
+summary: Reroute a request to a different origin and modify the URL path.
+goal:
+  - Routing
+operation:
+  - Modify URL
+products:
+  - Snippets
+pcx_content_type: example
+title: Change origin and modify paths
+description: Route requests to a different origin, prepend a directory to the URL path, and remove specific segments.
+---
+
+This example demonstrates how to use Cloudflare Snippets to:
+
+- Reroute incoming requests to a different origin.
+- Prepend a directory to the URL path.
+- Remove specific segments from the URL path.
+
+```js
+export default {
+	async fetch(request) {
+		// Clone the original request to create a new request object
+		const newRequest = new Request(request);
+
+		// Add a header to identify a rerouted request at the new origin
+		newRequest.headers.set("X-Rerouted", "1");
+
+		// Clone and parse the original URL
+		const url = new URL(request.url);
+
+		// Step 1: Reroute to a different origin
+		url.hostname = "example.com"; // Change the hostname to the new origin
+
+		// Step 2: Append a directory to the path
+		url.pathname = `/new-path${url.pathname}`; // Prepend "/new-path" to the current path
+
+		// Step 3: Remove a specific segment from the path
+		url.pathname = url.pathname.replace("/remove-me", ""); // Rewrite `/remove-me/something` to `/something`
+
+		// Fetch the modified request from the updated URL
+		return await fetch(url, newRequest);
+	},
+};
+```
+
+This configuration will perform the following rewrites:
+
+| Request URL                         | URL after rewrite                  |
+| ----------------------------------- | ---------------------------------- |
+| `https://subdomain.example.com/foo` | `https://example.com/new-path/foo` |
+| `https://example.com/remove-me/bar` | `https://example.com/new-path/bar` |
+| `https://example.net/remove-me`     | `https://example.com/new-path`     |