[examples]: Updated router-sample

examples/common-patterns/routing-requests/README.md

@@ -9,11 +9,48 @@ spin build
 spin up
 ```
 
-To test the different routes, run the following commands:
+## Testing Endpoints
 
-```bash
+To test the different endpoints registered using the `itty-router`, run the following commands:
+
+### Sending a `GET` request to `/` 
+
+```console
 curl localhost:3000/
-# hello universe
-curl localhost:3000/hello/spin
-# Hello spin
+# Hello, Fermyon
+```
+
+### Sending a `GET` request to `/hello/:name`
+
+```console
+# Passing "Spin" for the route parameter :name
+curl localhost:3000/hello/Spin
+# Hello, Spin
+```
+
+### Sending a `GET` request to `/bye/:name`
+
+```console
+# Passing "Spin" for the route parameter :name 
+curl localhost:3000/bye/Spin
+# {"message": "Goodbye, Spin"}
+```
+
+### Sending a `GET` request to `/reverse-header-value`
+
+```console
+# Specifying the x-spin-demo header and printing response headers
+curl -i -H 'x-spin-demo:hello spin' localhost:3000/reverse-header-value
+# HTTP/1.1 200 OK
+# x-spin-demo: nips olleh
+# content-length: 0
+# date: Mon, 17 Feb 2025 13:52:52 GMT
+```
+
+### Sending a `POST` request to `/items`
+
+```console
+# Passing a JSON payload
+curl -XPOST -H 'content-type:application/json' -d '{ "message": "hello"}' localhost:3000/items
+# Item processed
 ```