gistfile1.cs

public class ContactManagerConfiguration : HostConfiguration
{
  public override void RegisterRequestProcessorsForOperation( HttpOperationDescription operation,
        IList<Processor> processors, MediaTypeProcessorMode mode)
    {
        processors.Add(new JsonProcessor(operation, mode));
        processors.Add(new FormUrlEncodedProcessor(operation, mode));
    }

    public override void RegisterResponseProcessorsForOperation( HttpOperationDescription operation,
        IList<Processor> processors, MediaTypeProcessorMode mode)
    {
        processors.Add(new JsonProcessor(operation, mode));
        processors.Add(new PngProcessor(operation, mode));
    }
}