Bug 242228

Description:
http/tests/privateClickMeasurement/attribution-conversion-through-fetch-keepalive.html

The first failure that I saw on the dashboard for Big Sur was on 4/6/2022 at 249355@main. This test has been a flaky failure or timeout for its entire history on the dashboard.

History:
https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2FprivateClickMeasurement%2Fattribution-conversion-through-fetch-keepalive.html&platform=ios&limit=50000

Diff:
--- /Volumes/Data/worker/ios-simulator-15-release-tests-wk2/build/layout-test-results/http/tests/privateClickMeasurement/attribution-conversion-through-fetch-keepalive-expected.txt
+++ /Volumes/Data/worker/ios-simulator-15-release-tests-wk2/build/layout-test-results/http/tests/privateClickMeasurement/attribution-conversion-through-fetch-keepalive-actual.txt
@@ -1,3 +1,5 @@
+CONSOLE MESSAGE: Origin http://localhost:8000 is not allowed by Access-Control-Allow-Origin. Status code: 404
+CONSOLE MESSAGE: Fetch API cannot load https://127.0.0.1:8443/.well-known/private-click-measurement/trigger-attribution/12 due to access control checks.
 CONSOLE MESSAGE: [Private Click Measurement] Triggering event was not accepted because the URL path contained unrecognized parts.
 CONSOLE MESSAGE: Origin http://127.0.0.1:8000 is not allowed by Access-Control-Allow-Origin. Status code: 404
 CONSOLE MESSAGE: Fetch API cannot load https://127.0.0.1:8443/.well-known/private-click-measurement/trigger-attribution/whatever due to access control checks.