C # HttpClient throws exception without Sucess status codes

I have a very strange problem. When I request a web page that returns a status code that is not a 2 ** status code than HttpClient throws ecxeption.

Implementation:

try {

    //post-anfrage an webservice starten
    var request = await httpClient.PostAsync(SettingsPage.WebServiceURL + site,
                content);

    if (!request.IsSuccessStatusCode) {
        if (request.StatusCode == System.Net.HttpStatusCode.Unauthorized) {
            await User.Instance.Logout();
        }
        var message = await request.Content.ReadAsStringAsync();
        RaiseErrorMessage(null, message);
    }

    SaveCookies(request);

    timer.Change(PING_INTERVAL, PING_INTERVAL);

    return request;
}
catch (TaskCanceledException e) {
    RaiseConnectionError(null, "Verbindung zu Webservice fehlgeschlagen!");
    return null;
}
catch (Exception ex) {
    RaiseConnectionError(null, "Es ist etwas schief gelaufen..." + System.Environment.NewLine + "Bitte Support Kontaktieren!");
    Debug.WriteLine("AppWarehouse.pro: " + ex.Message);
    Debug.WriteLine("AppWarehouse.pro: " + ex.StackTrace);
    return null;
}
}

      

        
        
        
      

    

I don't understand why he does what he does. There is no reason for me to do this. I would be happy to fix or help fix this.