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WCF REST Client Exception

I have the following WCF client code:

string add = String.Format("http://localhost:{0}/ServiceRequestRest",accessPort);
var cf = new ChannelFactory<IServiceRequestRest>(new WebHttpBinding(), add);
cf.Endpoint.Behaviors.Add(new WebHttpBehavior());
busService = cf.CreateChannel();

busService.DoMyStuff("hello",null);

When I have the “first chance of exception” activated, this last line of code throws a series of exceptions. First exception:

System.InvalidOperationException occurred
  Message = "Envelope Version 'EnvelopeNone (http://schemas.microsoft.com/ws/2005/05/envelope/none)' does not support adding Message Headers."
  Source = "System.ServiceModel"
  Stacktrace:
       at System.ServiceModel.Channels.MessageHeaders.ValidateHeaderKind (HeaderKind headerKind)

I do not know that I am trying to "add message headers", but I decided to continue execution and immediately get the following exception:

System.Net.WebException occurred
  Message = "The underlying connection was closed: The connection was closed unexpectedly."
  Source="System"
  StackTrace:
       at System.Net.HttpWebRequest.GetResponse()

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