multiple-early-hints-preconnects.html

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<meta charset=utf-8>

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

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

<script src="/speculation-rules/speculation-measurement/support/speculation-measurement-utils.js"></script>

<body>

<script>

// This document was served with two 103 Early Hints responses, each

// preconnecting to a different origin (see multiple-early-hints-preconnects.h2.py).

// TODO(crbug.com/527144295): It seems like Chromium only honors the first

// Early Hints response, so only the first origin's preconnect should be recorded.

const params = new URLSearchParams(location.search);

const firstOrigin = new URL(params.get('first-preconnect')).origin;

const secondOrigin = new URL(params.get('second-preconnect')).origin;

test(() => {

  assert_true(typeof performance.getSpeculations === 'function',

    "SpeculationMeasurement feature must be enabled");

  const preconnects = performance.getSpeculations().preconnects;

  const first = findPreconnectsByOrigin(preconnects, firstOrigin);

  assert_equals(first.length, 1,

    "the first 103 response's preconnect should be recorded");

  assert_true(first[0].earlyhint,

    "earlyhint should be true for an Early Hints preconnect");

  const second = findPreconnectsByOrigin(preconnects, secondOrigin);

  assert_equals(second.length, 0,

    "second and subsequent 103 responses are ignored, so their preconnects " +

    "should not be recorded");

}, "Only the first of multiple 103 Early Hints responses contributes preconnects");

</script>

</body>