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How to use testSizedRange method in wpt

Best JavaScript code snippet using wpt

sw.https.window.js

Source:sw.https.window.js

...125  const length = 100;126  const count = 3;127  const counts = {};128  // test a single range request size129  async function testSizedRange(size, partialResponseCode) {130    const rangeId = Math.random() + '';131    const rangeBroadcast = awaitMessage(w.navigator.serviceWorker, rangeId);132    // Create a bogus audo element to trick the browser into sending133    // cross-origin range requests that can be manipulated by the service worker.134    const sound_url = new URL('partial-text.py', w.location);135    sound_url.hostname = REMOTE_HOST;136    sound_url.searchParams.set('action', 'record-media-range-request');137    sound_url.searchParams.set('length', length);138    sound_url.searchParams.set('size', size);139    sound_url.searchParams.set('partial', partialResponseCode);140    sound_url.searchParams.set('id', rangeId);141    appendAudio(w.document, sound_url);142    // wait for the range requests to happen143    await rangeBroadcast;144    // Create multiple preload requests and count the number of resource timing145    // entries that get created to make sure 206 and 416 range responses are treated146    // the same.147    const url = new URL('partial-text.py', w.location);148    url.searchParams.set('action', 'use-media-range-request');149    url.searchParams.set('size', size);150    counts['size' + size] = 0;151    for (let i = 0; i < count; i++) {152      await preloadImage(url, { doc: w.document });153    }154  }155  // Test range requests from 1 smaller than the correct size to 1 larger than156  // the correct size to exercise the various permutations using the default 206157  // response code for successful range requests.158  for (let size = length - 1; size <= length + 1; size++) {159    await testSizedRange(size, '206');160  }161  // Test a successful range request using a 200 response.162  await testSizedRange(length - 2, '200');163  // Check the resource timing entries and count the reported number of fetches of each type164  const resources = w.performance.getEntriesByType("resource");165  for (const entry of resources) {166    const url = new URL(entry.name);167    if (url.searchParams.has('action') &&168        url.searchParams.get('action') == 'use-media-range-request' &&169        url.searchParams.has('size')) {170      counts['size' + url.searchParams.get('size')]++;171    }172  }173  // Make sure there are a non-zero number of preload requests and they are all the same174  let counts_valid = true;175  const first = 'size' + (length - 2);176  for (let size = length - 2; size <= length + 1; size++) {...

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