This page is served directly by IcegateCallbackReceiver, so no separate static server is
needed — just run this project and browse to its own URL. It still calls the Agent
(http://127.0.0.1:9095) cross-origin from the browser, since
127.0.0.1 and localhost are different origins even on the same
machine — the Agent's Api:AllowedOrigins config must include this page's
actual origin (check the address bar) for the request below to succeed.