feat(service-worker): support sendRequest as a notificationclick action (#46912)

Implement a new `notificationclick` action, `sendRequest`, which sends a
GET request to the specified URL, without opening a new window. This can
be useful for hitting an API endpoint.

PR Close #46912

aio/content/guide/service-worker-notifications.md

@@ -61,11 +61,12 @@ The Angular service worker supports the following operations:
 | `openWindow`                | Opens a new tab at the specified URL, which is resolved relative to the service worker scope.                                                                                                            |
 | `focusLastFocusedOrOpen`    | Focuses the last focused client. If there is no client open, then it opens a new tab at the specified URL, which is resolved relative to the service worker scope.                                       |
 | `navigateLastFocusedOrOpen` | Focuses the last focused client and navigates it to the specified URL, which is resolved relative to the service worker scope. If there is no client open, then it opens a new tab at the specified URL. |
+| `sendRequest`               | Send a simple GET request to the specified URL.                                                                                                                                                          |
 
 <div class="alert is-important">
 
 If an `onActionClick` item does not define a `url`, then the service worker's registration scope is used.
-  
+
 </div>
 
 ### Actions
@@ -86,14 +87,16 @@ In addition, using the `onActionClick` property on the `data` object, you can ti
       {"action": "foo", "title": "Open new tab"},
       {"action": "bar", "title": "Focus last"},
       {"action": "baz", "title": "Navigate last"},
-      {"action": "qux", "title": "Just notify existing clients"}
+      {"action": "qux", "title": "Send request in the background"}
+      {"action": "other", "title": "Just notify existing clients"}
     ],
     "data": {
       "onActionClick": {
         "default": {"operation": "openWindow"},
         "foo": {"operation": "openWindow", "url": "/absolute/path"},
         "bar": {"operation": "focusLastFocusedOrOpen", "url": "relative/path"},
-        "baz": {"operation": "navigateLastFocusedOrOpen", "url": "https://other.domain.com/"}
+        "baz": {"operation": "navigateLastFocusedOrOpen", "url": "https://other.domain.com/"},
+        "qux": {"operation": "sendRequest", "url": "https://yet.another.domain.com/"}
       }
     }
   }

packages/service-worker/worker/src/driver.ts

@@ -380,6 +380,10 @@ export class Driver implements Debuggable, UpdateSource {
         }
         break;
       }
+      case 'sendRequest': {
+        await this.scope.fetch(urlToOpen);
+        break;
+      }
       default:
         break;
     }

packages/service-worker/worker/test/happy_spec.ts

@@ -1035,6 +1035,55 @@ describe('Driver', () => {
         });
       });
 
+      describe('`sendRequest` operation', () => {
+        it('sends a GET request to the specified URL', async () => {
+          // Initialize the SW.
+          expect(await makeRequest(scope, '/foo.txt')).toBe('this is foo');
+          await driver.initialized;
+          server.clearRequests();
+
+          // Trigger a `notificationlick` event.
+          const url = '/some/url';
+          await scope.handleClick(
+              {
+                title: 'Test notification',
+                body: 'This is a test notifiction.',
+                data: {
+                  onActionClick: {
+                    foo: {operation: 'sendRequest', url},
+                  },
+                },
+              },
+              'foo');
+
+          // Expect request to the server.
+          server.assertSawRequestFor('/some/url');
+        });
+
+        it('falls back to sending a request to `/` when no URL is specified', async () => {
+          // Initialize the SW.
+          expect(await makeRequest(scope, '/foo.txt')).toBe('this is foo');
+          await driver.initialized;
+          server.clearRequests();
+
+          // Trigger a `notificationlick` event.
+          await scope.handleClick(
+              {
+                title: 'Test notification',
+                body: 'This is a test notifiction.',
+                data: {
+                  onActionClick: {
+                    bar: {operation: 'sendRequest'},
+                  },
+                },
+              },
+              'bar');
+
+          // Expect request to the server.
+          server.assertSawRequestFor('/');
+        });
+      });
+
       describe('No matching onActionClick field', () => {
         it('no client interaction', async () => {
           expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');