Could not add Access-Control-Allow-Origin to my WCF library Project

Question

I\'m trying to understand why this ajax called doesn\'t work

 $.ajax({
        type: \'GET\',
        url: \"http://localhost:8732/Design_Time_Addresses/InMotion         


        

Answer 1

For WCF service you have to develop new behavior and include it in the endpoint configuration:

1. Create Message Inspector

       public class CustomHeaderMessageInspector : IDispatchMessageInspector
       {
           Dictionary requiredHeaders;
           public CustomHeaderMessageInspector (Dictionary headers)
           {
               requiredHeaders = headers ?? new Dictionary();
           }
   
           public object AfterReceiveRequest(ref System.ServiceModel.Channels.Message request, System.ServiceModel.IClientChannel channel, System.ServiceModel.InstanceContext instanceContext)
           {
               return null;
           }
   
           public void BeforeSendReply(ref System.ServiceModel.Channels.Message reply, object correlationState)
           {
               var httpHeader = reply.Properties["httpResponse"] as HttpResponseMessageProperty;
               foreach (var item in requiredHeaders)
               {
                   httpHeader.Headers.Add(item.Key, item.Value);
               }           
           }
       }
   

2. Create Endpoint Behavior and use Message Inspector to add headers

       public class EnableCrossOriginResourceSharingBehavior : BehaviorExtensionElement, IEndpointBehavior
       {
           public void AddBindingParameters(ServiceEndpoint endpoint, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
           {
   
           }
   
           public void ApplyClientBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.ClientRuntime clientRuntime)
           {
   
           }
   
           public void ApplyDispatchBehavior(ServiceEndpoint endpoint, System.ServiceModel.Dispatcher.EndpointDispatcher endpointDispatcher)
           {
               var requiredHeaders = new Dictionary();
   
               requiredHeaders.Add("Access-Control-Allow-Origin", "*");
               requiredHeaders.Add("Access-Control-Request-Method", "POST,GET,PUT,DELETE,OPTIONS");
               requiredHeaders.Add("Access-Control-Allow-Headers", "X-Requested-With,Content-Type");
   
               endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new CustomHeaderMessageInspector(requiredHeaders));
           }
   
           public void Validate(ServiceEndpoint endpoint)
           {
   
           }
   
           public override Type BehaviorType
           {
               get { return typeof(EnableCrossOriginResourceSharingBehavior); }
           }
   
           protected override object CreateBehavior()
           {
               return new EnableCrossOriginResourceSharingBehavior();
           }
       }
   

3. Register new behavior in web.config

4. Add new behavior to endpoint behavior configuration

5. Configure endpoint