C # Post request to work in their default not work with all web servers.
It can happen that when a misconfigured web server a "(417) Expectation Failed" WebException is thrown, because the web server not a "100-continue" returns.
Very annoying and not something simply off well, but it is yet.
// "HTTP_EXPECT" Abschalten System.Net.ServicePointManager.Expect100Continue = false;
Vielen Dank für die Lösung an haacked.com .
