WCF REST客户端异常

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);

当我激活“FirstChanceExceptionBreak”时,最后一行代码抛出一系列异常。第一个例外是:

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)

我不知道我正在尝试“添加邮件头”,但我选择继续执行并立即获取下一个异常:

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

更新 :无法序列化REST调用的返回类型,我从 another site

更新2 interference from Skype . 代码正在工作。:)