update-no-cache-request-headers.https.html

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This test has a WPT meta file that expects 1 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /service-workers/service-worker/update-no-cache-request-headers.https.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<meta charset="utf-8">

<title>Test that cache is being bypassed/validated in no-cache mode on update</title>

<script src="/resources/testharness.js"></script>

<script src="/resources/testharnessreport.js"></script>

<script src="resources/test-helpers.sub.js"></script>

<script>

// Tests a service worker script fetch during an update check which

// bypasses/validates the browser cache. The fetch should have the

// 'if-none-match' request header.

//

// This tests the Update step:

//  "Set request’s cache mode to "no-cache" if any of the following are true..."

// https://w3c.github.io/ServiceWorker/#update-algorithm

//

// The test works by registering a service worker with |updateViaCache|

// set to "none". It then does an update. The test server responds with

// an updated worker script that remembers the http request headers.

// The updated worker reports back these headers to the test page.

promise_test(async (t) => {

  const script = "resources/test-request-headers-worker.py";

  const scope = "resources/";

  // Register the service worker.

  await service_worker_unregister(t, scope);

  const registration = await navigator.serviceWorker.register(

      script, {scope, updateViaCache: 'none'});

  await wait_for_state(t, registration.installing, 'activated');

  // Do an update.

  await registration.update();

  // Ask the new worker what the request headers were.

  const newWorker = registration.installing;

  const sawMessage = new Promise((resolve) => {

    navigator.serviceWorker.onmessage = (event) => {

      resolve(event.data);

};

});

  newWorker.postMessage('getHeaders');

  const result = await sawMessage;

  // Test the result.

  assert_equals(result['service-worker'], 'script');

  assert_equals(result['if-none-match'], 'etag');

}, 'headers in no-cache mode');

</script>