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chromium/third_party/blink/web_tests/external/wpt/speculation-rules/prefetch/anonymous-client.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({ hostname: PREFETCH_PROXY_BYPASS_HOST, page: 2 });
    await agent.forceSinglePrefetch(nextUrl, { requires: ["anonymous-client-ip-when-cross-origin"] });
    await agent.navigate(nextUrl);

    let requestHeaders = await agent.getRequestHeaders();
    assert_in_array(requestHeaders.purpose, ["", "prefetch"], "The vendor-specific header Purpose, if present, must be 'prefetch'.");
    assert_equals(requestHeaders.sec_purpose, "prefetch;anonymous-client-ip");
  }, "test anonymous-client url prefetch for cross origin pages");
</script>