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copied!<p>Create a class that implements <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.dispatcher.iclientmessageinspector.aspx" rel="nofollow noreferrer">IClientMessageInspector</a>. In the BeforeSendRequest method, add your custom header to the outgoing message. It might look something like this:</p> <pre><code>public object BeforeSendRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel) { HttpRequestMessageProperty httpRequestMessage; object httpRequestMessageObject; if (request.Properties.TryGetValue(HttpRequestMessageProperty.Name, out httpRequestMessageObject)) { httpRequestMessage = httpRequestMessageObject as HttpRequestMessageProperty; if (string.IsNullOrEmpty(httpRequestMessage.Headers[USER_AGENT_HTTP_HEADER])) { httpRequestMessage.Headers[USER_AGENT_HTTP_HEADER] = this.m_userAgent; } } else { httpRequestMessage = new HttpRequestMessageProperty(); httpRequestMessage.Headers.Add(USER_AGENT_HTTP_HEADER, this.m_userAgent); request.Properties.Add(HttpRequestMessageProperty.Name, httpRequestMessage); } return null; } </code></pre> <p>Then create an endpoint behavior that applies the message inspector to the client runtime. You could apply the behavior as an attributes, or using a behavior extension element.</p> <p>Here is a great <a href="http://msmvps.com/blogs/paulomorgado/archive/2007/04/27/wcf-building-an-http-user-agent-message-inspector.aspx" rel="nofollow noreferrer">example</a> of how to add an HTTP user-agent header to all request messages. I am using this in a few of my clients. You could undoubtedly do something similar for just about any header. You can also do the same on the service side by implementing the <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.dispatcher.idispatchmessageinspector.aspx" rel="nofollow noreferrer">IDispatchMessageInspector</a>.</p> <p>Is this what you had in mind?</p>

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