fix(@angular/ssr): prevent redirect loop with encoded query parameters

Previously, encoded query parameters caused a mismatch between the requested URL and the reconstructed URL, leading to a redirect loop. This change ensures both URLs are decoded before comparison.

Closes #31881

Author: alan-agius4

packages/angular/ssr/src/utils/ng.ts

@@ -111,8 +111,10 @@ export async function renderAngular(
       hasNavigationError = false;
       const { pathname, search, hash } = envInjector.get(PlatformLocation);
       const finalUrl = [stripTrailingSlash(pathname), search, hash].join('');
+      const finalUrlHref = decodeURIComponent(new URL(finalUrl, urlToRender.origin).href);
+      const urlToRenderHref = decodeURIComponent(urlToRender.href);
 
-      if (urlToRender.href !== new URL(finalUrl, urlToRender.origin).href) {
+      if (urlToRenderHref !== finalUrlHref) {
         redirectTo = finalUrl;
       }
     }

packages/angular/ssr/test/app-engine_spec.ts

@@ -269,5 +269,12 @@ describe('AngularAppEngine', () => {
       const response = await appEngine.handle(request);
       expect(await response?.text()).toContain('Home works');
     });
+
+    it('should not decode query parameters', async () => {
+      const request = new Request('https://example.com/home?email=xyz%40xyz.com');
+      const response = await appEngine.handle(request);
+      expect(response?.status).toBe(200);
+      expect(await response?.text()).toContain('Home works');
+    });
   });
 });