Question

I have a WCF Service defined as:

[ServiceContract]
[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
public class Service
{
    [OperationContract]
    [WebGet(ResponseFormat = WebMessageFormat.Json)]
    public string HelloWorld()
    {
        return "Hello World";
    }
}

My Web.Config file:

<configuration>
  <system.web>
    <compilation debug="true" targetFramework="4.0"/>
  </system.web>
  <system.serviceModel>
    <behaviors>
      <serviceBehaviors>
        <behavior name="">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
        <endpointBehaviors>
            <behavior name="webHttpBehavior">
                <webHttp />
            </behavior>
        </endpointBehaviors>
    </behaviors>
    <bindings>
      <webHttpBinding>
        <binding name="webHttpBindingWithJsonP" crossDomainScriptAccessEnabled="true"/>
      </webHttpBinding>
    </bindings>
    <services>
      <service name="Service">
        <endpoint address="" binding="webHttpBinding" bindingConfiguration="webHttpBindingWithJsonP" contract="Service" behaviorConfiguration="webHttpBehavior"/>
      </service>
    </services>
    <serviceHostingEnvironment multipleSiteBindingsEnabled="true" aspNetCompatibilityEnabled="true"/>
  </system.serviceModel>
</configuration>

I want to be able to access ASP .Net session variables in my WCF service, and I want the WCF service to be returning JSONP data, however even with this simple service, browsing to ../Service.svc/HelloWorld I am getting a 400 Bad Request error.

Can someone point me in the right direction?

Answer 1

Looks like the combination of JSONP, ASP.NET Compatibility and an authenticated user is not supported per this Microsoft forum.

According to the moderator of the forum, you need to disable one of the three.

Probably not the answer you were hoping for, but the moderator’s explanation is pretty good and offers a few suggestions.

Hope this helps. Good luck!