Example WCF config for content type negotation with JSON/XML AND SOAP

web.config

<?xml version="1.0"?>
<configuration>
    <system.web>
        <compilation debug="true" targetFramework="4.0" />
    </system.web>
      <system.serviceModel>
        <services>
          <service name="Service.HelloWorldService" behaviorConfiguration="wsdl">
            <endpoint address="soap" binding="basicHttpBinding" contract="Service.IHelloWorldService" />
            <endpoint address="xml" binding="webHttpBinding"  behaviorConfiguration="restBehavior" contract="Service.IHelloWorldServicee" />
          </service>
        </services>
        <behaviors>
          <serviceBehaviors>
            <behavior name="wsdl" >
              <serviceMetadata httpGetEnabled="true" /> <!-- because we want to have a wsdl -->
              <serviceDebug includeExceptionDetailInFaults="true" /> <!-- because we want to know what went wrong -->
            </behavior>            
          </serviceBehaviors>
          <endpointBehaviors>
            <behavior name="restBehavior">
              <!-- content type negotation -->
              <webHttp automaticFormatSelectionEnabled="true" helpEnabled="true" faultExceptionEnabled="true"/>
            </behavior>
          </endpointBehaviors>
        </behaviors>
    </system.serviceModel>
</configuration>