WCF: Why is HttpResponse not registering here?

I am trying samples from Learning WCF book and trying to validate HTTP request / response. I see HTTP request headers in MS TraceViewer, but strangely not the response headers. (envelope only). If you notice something amiss, could you please let me know?

<configuration>
  <system.serviceModel>
    <diagnostics>
      <messageLogging logEntireMessage="true" logMalformedMessages="true"
        logMessagesAtServiceLevel="true"/>
    </diagnostics>

<!--other stuff-->

    <system.diagnostics>
        <sources>
          <source name="System.ServiceModel" switchValue="Off, ActivityTracing">
            <listeners>
              <add type="System.Diagnostics.DefaultTraceListener" name="Default">
                <filter type="" />
              </add>
              <add initializeData="x.log" type="System.Diagnostics.XmlWriterTraceListener"
                name="sdt">
                <filter type="" />
              </add>
            </listeners>
          </source>
          <source name="System.ServiceModel.MessageLogging" switchValue="Verbose,ActivityTracing">
            <listeners>
              <add type="System.Diagnostics.DefaultTraceListener" name="Default">
                <filter type="" />
              </add>
              <add name="ServiceModelMessageLoggingListener">
                <filter type="" />
              </add>
            </listeners>
          </source>
        </sources>
        <sharedListeners>
          <add initializeData="D:\temp\messages.xml" type="System.Diagnostics.XmlWriterTraceListener, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
            name="ServiceModelMessageLoggingListener" traceOutputOptions="Timestamp">
            <filter type="" />
          </add>
        </sharedListeners>
        <trace autoflush="true" />
      </system.diagnostics>
</configuration>

      

        
        
        
      

    

The request is being logged correctly:

<MessageLogTraceRecord>
<HttpRequest xmlns="http://schemas.microsoft.com/2004/06/ServiceModel/Management/MessageTrace">
<Method>POST</Method>
<QueryString></QueryString>
<WebHeaders>
<SOAPAction>"http://www.thatindigogirl.com/samples/2006/06/GigManagerServiceContract/SaveGig"</SOAPAction>
<Connection>Keep-Alive</Connection>
<Content-Length>485</Content-Length>
<Content-Type>text/xml; charset=utf-8</Content-Type>
<Expect>100-continue</Expect>
<Host>localhost:8000</Host>
</WebHeaders>
</HttpRequest>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<To s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://localhost:8000/GigManagerService</To>
<Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://www.thatindigogirl.com/samples/2006/06/GigManagerServiceContract/SaveGig</Action>
</s:Header>
<s:Body>
<SaveGig xmlns="http://www.thatindigogirl.com/samples/2006/06">
<item xmlns:a="wcf_expts" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
<a:DateEnd>2009-11-01T05:30:00</a:DateEnd>
<a:DateStart>2009-10-31T22:30:00</a:DateStart>
<a:Description>some desc</a:Description>
<a:Id>0</a:Id>
<a:Place i:nil="true"></a:Place>
<a:Title>some boring event</a:Title>
<a:Url>http://askfdj.com</a:Url>
</item>
</SaveGig>
</s:Body>
</s:Envelope>
</MessageLogTraceRecord>

      

        
        
        
      

    

and the response I see in Trace Viewer (why no headers, HTTP response?)

<MessageLogTraceRecord>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Header>
<Action s:mustUnderstand="1" xmlns="http://schemas.microsoft.com/ws/2005/05/addressing/none">http://www.thatindigogirl.com/samples/2006/06/GigManagerServiceContract/SaveGigResponse</Action>
</s:Header>
<s:Body>
<SaveGigResponse xmlns="http://www.thatindigogirl.com/samples/2006/06"></SaveGigResponse>
</s:Body>
</s:Envelope>
</MessageLogTraceRecord>