Adding HTTP request header to WCF request
The simplest way to this is using WebOperationContext at the following way:
Service1Client serviceClient = new Service1Client();using (new System.ServiceModel.OperationContextScope((System.ServiceModel.IClientChannel)serviceClient.InnerChannel)){ System.ServiceModel.Web.WebOperationContext.Current.OutgoingRequest.Headers.Add("AdminGUID", "someGUID"); serviceClient.GetData();}Taken from this post
Make a new WebRequest object of type HttpWebRequest. Set the header and get the response.
WebRequest req = HttpWebRequest.Create("myURL") as HttpWebRequest;req.Headers.Add("AdminGUID", "value");HttpWebResponse response = (HttpWebResponse)request.GetResponse();for a more in depth example of webrequest, see this page