-
Notifications
You must be signed in to change notification settings - Fork 25.3k
/
happy_spec.ts
654 lines (558 loc) Β· 23.1 KB
/
happy_spec.ts
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
/**
* @license
* Copyright Google Inc. All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {CacheDatabase} from '../src/db-cache';
import {Driver} from '../src/driver';
import {Manifest} from '../src/manifest';
import {sha1} from '../src/sha1';
import {MockRequest} from '../testing/fetch';
import {MockFileSystemBuilder, MockServerStateBuilder, tmpHashTableForFs} from '../testing/mock';
import {SwTestHarness, SwTestHarnessBuilder} from '../testing/scope';
import {async_beforeEach, async_fit, async_it} from './async';
const dist =
new MockFileSystemBuilder()
.addFile('/foo.txt', 'this is foo')
.addFile('/bar.txt', 'this is bar')
.addFile('/baz.txt', 'this is baz')
.addFile('/qux.txt', 'this is qux')
.addFile('/quux.txt', 'this is quux')
.addUnhashedFile('/unhashed/a.txt', 'this is unhashed', {'Cache-Control': 'max-age=10'})
.build();
const distUpdate =
new MockFileSystemBuilder()
.addFile('/foo.txt', 'this is foo v2')
.addFile('/bar.txt', 'this is bar')
.addFile('/baz.txt', 'this is baz v2')
.addFile('/qux.txt', 'this is qux v2')
.addFile('/quux.txt', 'this is quux v2')
.addUnhashedFile('/unhashed/a.txt', 'this is unhashed v2', {'Cache-Control': 'max-age=10'})
.build();
const manifest: Manifest = {
configVersion: 1,
appData: {
version: 'original',
},
index: '/foo.txt',
assetGroups: [
{
name: 'assets',
installMode: 'prefetch',
updateMode: 'prefetch',
urls: [
'/foo.txt',
'/bar.txt',
'/redirected.txt',
],
patterns: [
'/unhashed/.*',
],
},
{
name: 'other',
installMode: 'lazy',
updateMode: 'lazy',
urls: [
'/baz.txt',
'/qux.txt',
],
patterns: [],
},
{
name: 'lazy_prefetch',
installMode: 'lazy',
updateMode: 'prefetch',
urls: ['/quux.txt'],
patterns: [],
}
],
hashTable: tmpHashTableForFs(dist),
};
const manifestUpdate: Manifest = {
configVersion: 1,
appData: {
version: 'update',
},
index: '/foo.txt',
assetGroups: [
{
name: 'assets',
installMode: 'prefetch',
updateMode: 'prefetch',
urls: [
'/foo.txt',
'/bar.txt',
'/redirected.txt',
],
patterns: [
'/unhashed/.*',
],
},
{
name: 'other',
installMode: 'lazy',
updateMode: 'lazy',
urls: [
'/baz.txt',
'/qux.txt',
],
patterns: [],
},
{
name: 'lazy_prefetch',
installMode: 'lazy',
updateMode: 'prefetch',
urls: ['/quux.txt'],
patterns: [],
}
],
hashTable: tmpHashTableForFs(distUpdate),
};
const server = new MockServerStateBuilder()
.withStaticFiles(dist)
.withManifest(manifest)
.withRedirect('/redirected.txt', '/redirect-target.txt', 'this was a redirect')
.withError('/error.txt')
.build();
const serverUpdate =
new MockServerStateBuilder()
.withStaticFiles(distUpdate)
.withManifest(manifestUpdate)
.withRedirect('/redirected.txt', '/redirect-target.txt', 'this was a redirect')
.build();
const server404 = new MockServerStateBuilder().withStaticFiles(dist).build();
const scope = new SwTestHarnessBuilder().withServerState(server).build();
const manifestHash = sha1(JSON.stringify(manifest));
const manifestUpdateHash = sha1(JSON.stringify(manifestUpdate));
export function main() {
// Skip environments that don't support the minimum APIs needed to run the SW tests.
if (!SwTestHarness.envIsSupported()) {
return;
}
describe('Driver', () => {
let scope: SwTestHarness;
let driver: Driver;
beforeEach(() => {
server.clearRequests();
scope = new SwTestHarnessBuilder().withServerState(server).build();
driver = new Driver(scope, scope, new CacheDatabase(scope, scope));
});
async_it('initializes prefetched content correctly, after activation', async() => {
expect(await scope.startup(true)).toEqual(true);
await scope.resolveSelfMessages();
await driver.initialized;
server.assertSawRequestFor('ngsw.json');
server.assertSawRequestFor('/foo.txt');
server.assertSawRequestFor('/bar.txt');
server.assertSawRequestFor('/redirected.txt');
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
expect(await makeRequest(scope, '/bar.txt')).toEqual('this is bar');
server.assertNoOtherRequests();
});
async_it('initializes prefetched content correctly, after a request kicks it off', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.assertSawRequestFor('ngsw.json');
server.assertSawRequestFor('/foo.txt');
server.assertSawRequestFor('/bar.txt');
server.assertSawRequestFor('/redirected.txt');
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
expect(await makeRequest(scope, '/bar.txt')).toEqual('this is bar');
server.assertNoOtherRequests();
});
async_it('handles non-relative URLs', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.clearRequests();
expect(await makeRequest(scope, 'http://localhost/foo.txt')).toEqual('this is foo');
server.assertNoOtherRequests();
});
async_it('handles actual errors from the browser', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.clearRequests();
const [resPromise, done] = scope.handleFetch(new MockRequest('/error.txt'), 'default');
await done;
const res = (await resPromise) !;
expect(res.status).toEqual(504);
expect(res.statusText).toEqual('Gateway Timeout');
});
async_it('handles redirected responses', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.clearRequests();
expect(await makeRequest(scope, '/redirected.txt')).toEqual('this was a redirect');
server.assertNoOtherRequests();
});
async_it('caches lazy content on-request', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.clearRequests();
expect(await makeRequest(scope, '/baz.txt')).toEqual('this is baz');
server.assertSawRequestFor('/baz.txt');
server.assertNoOtherRequests();
expect(await makeRequest(scope, '/baz.txt')).toEqual('this is baz');
server.assertNoOtherRequests();
expect(await makeRequest(scope, '/qux.txt')).toEqual('this is qux');
server.assertSawRequestFor('/qux.txt');
server.assertNoOtherRequests();
});
async_it('updates to new content when requested', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
const client = scope.clients.getMock('default') !;
expect(client.messages).toEqual([]);
scope.updateServerState(serverUpdate);
expect(await driver.checkForUpdate()).toEqual(true);
serverUpdate.assertSawRequestFor('ngsw.json');
serverUpdate.assertSawRequestFor('/foo.txt');
serverUpdate.assertSawRequestFor('/redirected.txt');
serverUpdate.assertNoOtherRequests();
expect(client.messages).toEqual([{
type: 'UPDATE_AVAILABLE',
current: {hash: manifestHash, appData: {version: 'original'}},
available: {hash: manifestUpdateHash, appData: {version: 'update'}},
}]);
// Default client is still on the old version of the app.
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
// Sending a new client id should result in the updated version being returned.
expect(await makeRequest(scope, '/foo.txt', 'new')).toEqual('this is foo v2');
// Of course, the old version should still work.
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
expect(await makeRequest(scope, '/bar.txt')).toEqual('this is bar');
serverUpdate.assertNoOtherRequests();
});
async_it('updates to new content when requested', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
const client = scope.clients.getMock('default') !;
expect(client.messages).toEqual([]);
scope.updateServerState(serverUpdate);
expect(await driver.checkForUpdate()).toEqual(true);
serverUpdate.assertSawRequestFor('ngsw.json');
serverUpdate.assertSawRequestFor('/foo.txt');
serverUpdate.assertSawRequestFor('/redirected.txt');
serverUpdate.assertNoOtherRequests();
expect(client.messages).toEqual([{
type: 'UPDATE_AVAILABLE',
current: {hash: manifestHash, appData: {version: 'original'}},
available: {hash: manifestUpdateHash, appData: {version: 'update'}},
}]);
// Default client is still on the old version of the app.
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
// Sending a new client id should result in the updated version being returned.
expect(await makeRequest(scope, '/foo.txt', 'new')).toEqual('this is foo v2');
// Of course, the old version should still work.
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
expect(await makeRequest(scope, '/bar.txt')).toEqual('this is bar');
serverUpdate.assertNoOtherRequests();
});
async_it('updates a specific client to new content on request', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
const client = scope.clients.getMock('default') !;
expect(client.messages).toEqual([]);
scope.updateServerState(serverUpdate);
expect(await driver.checkForUpdate()).toEqual(true);
serverUpdate.clearRequests();
await driver.updateClient(client as any as Client);
expect(client.messages).toEqual([
{
type: 'UPDATE_AVAILABLE',
current: {hash: manifestHash, appData: {version: 'original'}},
available: {hash: manifestUpdateHash, appData: {version: 'update'}},
},
{
type: 'UPDATE_ACTIVATED',
previous: {hash: manifestHash, appData: {version: 'original'}},
current: {hash: manifestUpdateHash, appData: {version: 'update'}},
}
]);
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo v2');
});
async_it('checks for updates on restart', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
scope = new SwTestHarnessBuilder()
.withCacheState(scope.caches.dehydrate())
.withServerState(serverUpdate)
.build();
driver = new Driver(scope, scope, new CacheDatabase(scope, scope));
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
serverUpdate.assertNoOtherRequests();
scope.advance(12000);
await driver.idle.empty;
serverUpdate.assertSawRequestFor('ngsw.json');
serverUpdate.assertSawRequestFor('/foo.txt');
serverUpdate.assertSawRequestFor('/redirected.txt');
serverUpdate.assertNoOtherRequests();
});
async_it('preserves multiple client assignments across restarts', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
scope.updateServerState(serverUpdate);
expect(await driver.checkForUpdate()).toEqual(true);
expect(await makeRequest(scope, '/foo.txt', 'new')).toEqual('this is foo v2');
serverUpdate.clearRequests();
scope = new SwTestHarnessBuilder()
.withServerState(serverUpdate)
.withCacheState(scope.caches.dehydrate())
.build();
driver = new Driver(scope, scope, new CacheDatabase(scope, scope));
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
expect(await makeRequest(scope, '/foo.txt', 'new')).toEqual('this is foo v2');
serverUpdate.assertNoOtherRequests();
});
async_it('updates when refreshed', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
const client = scope.clients.getMock('default') !;
scope.updateServerState(serverUpdate);
expect(await driver.checkForUpdate()).toEqual(true);
serverUpdate.clearRequests();
expect(await makeRequest(scope, '/baz', 'default', {
headers: {
'Accept': 'text/plain, text/html, text/css',
},
mode: 'navigate',
})).toEqual('this is foo v2');
expect(client.messages).toEqual([
{
type: 'UPDATE_AVAILABLE',
current: {hash: manifestHash, appData: {version: 'original'}},
available: {hash: manifestUpdateHash, appData: {version: 'update'}},
},
{
type: 'UPDATE_ACTIVATED',
previous: {hash: manifestHash, appData: {version: 'original'}},
current: {hash: manifestUpdateHash, appData: {version: 'update'}},
}
]);
serverUpdate.assertNoOtherRequests();
});
async_it('cleans up properly when manually requested', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
scope.updateServerState(serverUpdate);
expect(await driver.checkForUpdate()).toEqual(true);
serverUpdate.clearRequests();
expect(await makeRequest(scope, '/foo.txt', 'new')).toEqual('this is foo v2');
// Delete the default client.
scope.clients.remove('default');
// After this, the old version should no longer be cached.
await driver.cleanupCaches();
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo v2');
serverUpdate.assertNoOtherRequests();
});
async_it('cleans up properly on restart', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
scope = new SwTestHarnessBuilder()
.withCacheState(scope.caches.dehydrate())
.withServerState(serverUpdate)
.build();
driver = new Driver(scope, scope, new CacheDatabase(scope, scope));
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
serverUpdate.assertNoOtherRequests();
scope.clients.remove('default');
scope.advance(12000);
await driver.idle.empty;
serverUpdate.clearRequests();
driver = new Driver(scope, scope, new CacheDatabase(scope, scope));
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo v2');
const oldManifestHash = sha1(JSON.stringify(manifest));
const keys = await scope.caches.keys();
const hasOldCaches = keys.some(name => name.startsWith(oldManifestHash + ':'));
expect(hasOldCaches).toEqual(false);
});
async_it('shows notifications for push notifications', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
scope.clients.add('default');
await scope.handlePush({
notification: {
title: 'This is a test',
body: 'Test body',
}
});
expect(scope.notifications).toEqual([{
title: 'This is a test',
options: {body: 'Test body'},
}]);
expect(scope.clients.getMock('default') !.messages).toEqual([{
type: 'PUSH',
data: {
notification: {
title: 'This is a test',
body: 'Test body',
},
},
}]);
});
async_it('prefetches updates to lazy cache when set', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
expect(await makeRequest(scope, '/quux.txt')).toEqual('this is quux');
scope.updateServerState(serverUpdate);
expect(await driver.checkForUpdate()).toEqual(true);
serverUpdate.assertSawRequestFor('/quux.txt');
serverUpdate.clearRequests();
driver.updateClient(await scope.clients.get('default'));
expect(await makeRequest(scope, '/quux.txt')).toEqual('this is quux v2');
serverUpdate.assertNoOtherRequests();
});
async_it('unregisters when manifest 404s', async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
scope.updateServerState(server404);
expect(await driver.checkForUpdate()).toEqual(false);
expect(scope.unregistered).toEqual(true);
expect(await scope.caches.keys()).toEqual([]);
});
describe('unhashed requests', () => {
async_beforeEach(async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.clearRequests();
});
async_it('are cached appropriately', async() => {
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
server.assertSawRequestFor('/unhashed/a.txt');
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
server.assertNoOtherRequests();
});
async_it('avoid opaque responses', async() => {
expect(await makeRequest(scope, '/unhashed/a.txt', 'default', {
credentials: 'include'
})).toEqual('this is unhashed');
server.assertSawRequestFor('/unhashed/a.txt');
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
server.assertNoOtherRequests();
});
async_it('expire according to Cache-Control headers', async() => {
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
server.clearRequests();
// Update the resource on the server.
scope.updateServerState(serverUpdate);
// Move ahead by 15 seconds.
scope.advance(15000);
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
serverUpdate.assertNoOtherRequests();
// Another 6 seconds.
scope.advance(6000);
await driver.idle.empty;
serverUpdate.assertSawRequestFor('/unhashed/a.txt');
// Now the new version of the resource should be served.
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed v2');
server.assertNoOtherRequests();
});
async_it('survive serialization', async() => {
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
server.clearRequests();
const state = scope.caches.dehydrate();
scope = new SwTestHarnessBuilder().withCacheState(state).withServerState(server).build();
driver = new Driver(scope, scope, new CacheDatabase(scope, scope));
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.assertNoRequestFor('/unhashed/a.txt');
server.clearRequests();
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
server.assertNoOtherRequests();
// Advance the clock by 6 seconds, triggering the idle tasks. If an idle task
// was scheduled from the request above, it means that the metadata was not
// properly saved.
scope.advance(6000);
await driver.idle.empty;
server.assertNoRequestFor('/unhashed/a.txt');
});
async_it('get carried over during updates', async() => {
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
server.clearRequests();
scope = new SwTestHarnessBuilder()
.withCacheState(scope.caches.dehydrate())
.withServerState(serverUpdate)
.build();
driver = new Driver(scope, scope, new CacheDatabase(scope, scope));
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
scope.advance(15000);
await driver.idle.empty;
serverUpdate.assertNoRequestFor('/unhashed/a.txt');
serverUpdate.clearRequests();
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed');
serverUpdate.assertNoOtherRequests();
scope.advance(15000);
await driver.idle.empty;
serverUpdate.assertSawRequestFor('/unhashed/a.txt');
expect(await makeRequest(scope, '/unhashed/a.txt')).toEqual('this is unhashed v2');
serverUpdate.assertNoOtherRequests();
});
});
describe('routing', () => {
async_beforeEach(async() => {
expect(await makeRequest(scope, '/foo.txt')).toEqual('this is foo');
await driver.initialized;
server.clearRequests();
});
async_it('redirects to index on a route-like request', async() => {
expect(await makeRequest(scope, '/baz', 'default', {
headers: {
'Accept': 'text/plain, text/html, text/css',
},
mode: 'navigate',
})).toEqual('this is foo');
server.assertNoOtherRequests();
});
async_it('redirects to index on a request to the origin URL request', async() => {
expect(await makeRequest(scope, 'http://example.com', 'default', {
headers: {
'Accept': 'text/plain, text/html, text/css',
},
mode: 'navigate',
})).toEqual('this is foo');
server.assertNoOtherRequests();
});
async_it('does not redirect to index on a non-navigation request', async() => {
expect(await makeRequest(scope, '/baz', 'default', {
headers: {
'Accept': 'text/plain, text/html, text/css',
},
})).toBeNull();
server.assertSawRequestFor('/baz');
});
async_it('does not redirect to index on a request with an extension', async() => {
expect(await makeRequest(scope, '/baz.html', 'default', {
headers: {
'Accept': 'text/plain, text/html, text/css',
},
})).toBeNull();
server.assertSawRequestFor('/baz.html');
});
async_it('does not redirect to index on a request that does not expect HTML', async() => {
expect(await makeRequest(scope, '/baz', 'default', {
headers: {
'Accept': 'text/plain, text/css',
},
mode: 'navigate',
})).toBeNull();
server.assertSawRequestFor('/baz');
});
});
});
}
async function makeRequest(
scope: SwTestHarness, url: string, clientId?: string, init?: Object): Promise<string|null> {
const [resPromise, done] = scope.handleFetch(new MockRequest(url, init), clientId || 'default');
await done;
const res = await resPromise;
scope.clients.add(clientId || 'default');
if (res !== undefined && res.ok) {
return res.text();
}
return null;
}