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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prefetch/invalid-rules.https.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/dispatcher/dispatcher.js"></script>
<script src="/common/utils.js"></script>
<script src="../resources/utils.js"></script>
<script src="resources/utils.sub.js"></script>
<script>
  setup(() => assertSpeculationRulesIsSupported());

  promise_test(async t => {
    let agent = await spawnWindow(t);
    let nextUrl = agent.getExecutorURL({ page: 2 });
    await agent.forceSinglePrefetch(nextUrl, { invalid_key: "value" });
    await agent.navigate(nextUrl);

    assert_not_prefetched(await agent.getRequestHeaders());
  }, "an unrecognized key in a prefetch rule should prevent it from being fetched");
</script>