https://learn.microsoft.com/fr-fr/dotnet/api/system.net.http.httpclienthandler.useproxy?view=netframework-4.8.1&viewFallbackFrom=net-10.0
HttpClientHandler.UseProxy Property (System.Net.Http) | Microsoft Learn
Gets or sets a value that indicates whether the handler uses a proxy for requests.
property systemhttpmicrosoftlearn