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I am trying to create a REST Client proxy programatically in C# using the code below but I keep getting a CommunicationException error. Am I missing something?

public static class WebProxyFactory
{
    public static T Create<T>(string url) where T : class
    {
        ServicePointManager.Expect100Continue = false;
        WebHttpBinding binding = new WebHttpBinding();

        binding.MaxReceivedMessageSize = 1000000;

        WebChannelFactory<T> factory =
          new WebChannelFactory<T>(binding, new Uri(url));

        T proxy = factory.CreateChannel();

        return proxy;
    }

    public static T Create<T>(string url, string userName, string password)
      where T : class
    {
        ServicePointManager.Expect100Continue = false;
        WebHttpBinding binding = new WebHttpBinding();

        binding.Security.Mode =
          WebHttpSecurityMode.TransportCredentialOnly;
        binding.Security.Transport.ClientCredentialType =
          HttpClientCredentialType.Basic;
        binding.UseDefaultWebProxy = false;

        binding.MaxReceivedMessageSize = 1000000;

        WebChannelFactory<T> factory =
          new WebChannelFactory<T>(binding, new Uri(url));

        ClientCredentials credentials = factory.Credentials;
        credentials.UserName.UserName = userName;
        credentials.UserName.Password = password;

        T proxy = factory.CreateChannel();

        return proxy;
    }
}

So that I can use it as follows:

IMyRestService proxy = WebProxyFactory.Create<IMyRestService>(url, usr, pwd);
var result = proxy.GetSomthing(); // Fails right here