WCF Client - How to process or ignore a MustUnderstand header element?

I ran into a similar issue. I am not sure if this is useful or not.

MSDN WCF Extensibility

http://blogs.msdn.com/b/carlosfigueira/archive/2011/04/19/wcf-extensibility-message-inspectors.aspx

The setup here is Certificate based, Oracle Application Server 10g, and .Net to consume the services. Using SOAPUi was very useful while trying to figure out what was happening with the Request and then the response.

I have not tried modifying the code to use basicHttpBinding, but I used WSHttpBinding as the base of my configuration in code. Then used

 WSHttpBinding binding = new WSHttpBinding()
        {
            CloseTimeout = new TimeSpan(0, 1, 0),
            OpenTimeout = new TimeSpan(0, 1, 0),
            SendTimeout = new TimeSpan(0, 1, 0),
            AllowCookies = false,
            BypassProxyOnLocal = false,
            HostNameComparisonMode = HostNameComparisonMode.StrongWildcard,
            MaxBufferPoolSize = 524288,
            MaxReceivedMessageSize = 65536,
            MessageEncoding = WSMessageEncoding.Text,
            UseDefaultWebProxy = false,
            ReaderQuotas = new System.Xml.XmlDictionaryReaderQuotas()
            {
                MaxDepth = 32,
                MaxArrayLength = 16384,
                MaxBytesPerRead = 4096,
                MaxNameTableCharCount = 16384,
                MaxStringContentLength = 8192
            }
        };
        binding.Security.Mode = SecurityMode.Transport;
        binding.Security.Transport.ClientCredentialType = HttpClientCredentialType.Certificate;
        binding.Security.Transport.ProxyCredentialType = HttpProxyCredentialType.None;
        binding.Security.Transport.Realm = string.Empty;
        binding.Security.Message.ClientCredentialType = MessageCredentialType.Certificate;
        binding.Security.Message.EstablishSecurityContext = true;
        binding.Security.Message.NegotiateServiceCredential = true;

        CustomBinding customBinding = new CustomBinding();
        BindingElementCollection collection = binding.CreateBindingElements();

Looped through for the TextMessageEncodingBindingElement to set Soap11 and AddressingVersion to None.

 foreach (BindingElement element in collection)
        {
            if (typeof(TextMessageEncodingBindingElement) == element.GetType())
            {
                TextMessageEncodingBindingElement item = element as TextMessageEncodingBindingElement;
                if (null != item)
                {
                    item.MessageVersion = MessageVersion.CreateVersion(EnvelopeVersion.Soap11, AddressingVersion.None);
                    customBinding.Elements.Add(item);
                }
            }
            else
                customBinding.Elements.Add(element);
        }

I used the ChannelFactory and added an EndPoint Behavior for a Message Inspector. At this point I then had control of the request and I could add the appropriate header and modified the mustUnderstand on the Action.

Using SOAPUi I took my Message.ToString() and put that in SOAPUI and tested the request. Once the items that were needed were added to the request, it was then determined that the OAS server was not replying with all the necessary elements. Using the message inspector for the reply I modified the message to include the missing headers. I can't remember where I found the base code for the message inspector, but you would need to modify your code to utlize it properly.

For my example here are some snippets.

For the transform message in

 public object BeforeSendRequest

I needed to modify the Header, so using a for loop I grabbed the XElement and added the OASIS header and added a To header.

XNamespace xmlns = "http://schemas.xmlsoap.org/soap/envelope/";
                XElement securityHeader = new XElement(
                    xmlns + "Security", 
                    new XAttribute(xmlns + "wsse", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"), 
                    new XAttribute(xmlns + "xmlns", "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd"), 
                    new XAttribute(xmlns + "mustUnderstand", "0"));
                element.Add(securityHeader);

I also had to modify the Action Header

 else if (localName.Equals("Action", StringComparison.InvariantCultureIgnoreCase))
            {
                foreach (XAttribute a in element.Attributes())
                {
                    if (a.Name.LocalName == "mustUnderstand")
                        a.Value = "0";
                }
            }

My problem was that the Service didn't reply with an Action Header

So in the

 public void AfterReceiveReply

I called my TransformReply returning type Message with something like the following. You may need to modify values for the string.Empty, but this is just an example.

...

 Message reply = Message.CreateMessage(message.Version, null, reader);
        reply.Headers.Add(MessageHeader.CreateHeader("Action", string.Empty, string.Empty, false));
        reply.Properties.CopyProperties(message.Properties);

...

I would really suggest using a tool such as SOUPUI to beable to mess with the envelope and see the reply. If you do SSL, you'll need to create a cacert file and place it in the SSLSettings of the preferences.