Following code is working locally very fine. The users receive All notifications when I send them via local PC. But I need use proxy on the server and this code fires the error: "Failed to establish a ...

You can take advantage of HttpClientFactory to preconfigure named HttpClient instances. Note that the HttpClientFactory is a central location that can be used to register, configure, and consume ...

Using a single HttpClient in this way will keep connections open and not respect the DNS Time To Live (TTL) setting. Now the connections will never get DNS updates so the server you are talking to ...