docs: Update documentation http with integrity & referrer (#62462)

PR Close #62462

adev/src/content/guide/http/making-requests.md

@@ -434,6 +434,51 @@ Available `credentials` values:
 
 TIP: Use `credentials: 'include'` when you need to send authentication cookies or headers to a different domain that supports CORS. Avoid mixing `credentials` and `withCredentials` options to prevent confusion.
 
+#### Referrer
+
+The `referrer` option allows you to control what referrer information is sent with the request. This is important for privacy and security considerations.
+
+<docs-code language="ts">
+// Send a specific referrer URL
+http.get('/api/data', {
+  referrer: 'https://example.com/page'
+}).subscribe(data => {
+  // ...
+});
+
+// Use the current page as referrer (default behavior)
+http.get('/api/analytics', {
+  referrer: 'about:client'
+}).subscribe(data => {
+  // ...
+});
+</docs-code>
+
+The `referrer` option accepts:
+- A valid URL string: Sets the specific referrer URL to send
+- An empty string `''`: Sends no referrer information
+- `'about:client'`: Uses the default referrer (current page URL)
+
+TIP: Use `referrer: ''` for sensitive requests where you don't want to leak the referring page URL.
+
+#### Integrity
+
+The `integrity` option allows you to verify that the response hasn't been tampered with by providing a cryptographic hash of the expected content. This is particularly useful for loading scripts or other resources from CDNs.
+
+<docs-code language="ts">
+// Verify response integrity with SHA-256 hash
+http.get('/api/script.js', {
+  integrity: 'sha256-ABC123...',
+  responseType: 'text'
+}).subscribe(script => {
+  // Script content is verified against the hash
+});
+</docs-code>
+
+IMPORTANT: The `integrity` option requires an exact match between the response content and the provided hash. If the content doesn't match, the request will fail with a network error.
+
+TIP: Use subresource integrity when loading critical resources from external sources to ensure they haven't been modified. Generate hashes using tools like `openssl`.
+
 ## Http `Observable`s
 
 Each request method on `HttpClient` constructs and returns an `Observable` of the requested response type. Understanding how these `Observable`s work is important when using `HttpClient`.