fix(common): expose request url in network error (#27143)

closes #27029

PR Close #27143

packages/common/http/src/xhr.ts

@@ -232,10 +232,12 @@ export class HttpXhrBackend implements HttpBackend {
       // Connection timeout, DNS error, offline, etc. These are actual errors, and are
       // transmitted on the error channel.
       const onError = (error: ErrorEvent) => {
+        const {url} = partialFromXhr();
         const res = new HttpErrorResponse({
           error,
           status: xhr.status || 0,
           statusText: xhr.statusText || 'Unknown Error',
+          url: url || undefined,
         });
         observer.error(res);
       };

packages/common/http/test/xhr_spec.ts

@@ -142,6 +142,7 @@ const XSSI_PREFIX = ')]}\'\n';
       backend.handle(TEST_POST).subscribe(undefined, (err: HttpErrorResponse) => {
         expect(err instanceof HttpErrorResponse).toBe(true);
         expect(err.error instanceof Error);
+        expect(err.url).toBe('/test');
         done();
       });
       factory.mock.mockErrorEvent(new Error('blah'));