ServiceStack cache - jQuery ajax and JSONP - web-services

Question

Is there any way to force cache even when using ajax with JSONP?
Please see below three cases and results:
#1. Request from same host (save as page making the request) and with no JSONP - cache works corecctly.
$.ajax({
type: "GET",
url: "http://samehost.com",
data: "{ 'format': 'json' }",
contentType: "application/json",
success: function(data) {
// do stuff with data
}
});
#2. Request from different host with no JSONP, I get same origin policy error.
$.ajax({
type: "GET",
url: "http://differenthost.com",
data: "{ 'format': 'json' }",
contentType: "application/json",
success: function(data) {
// do stuff with data
}
});
#3. Request from different host and with JSONP the cache does not seems to work - it takes 2-3 sec to load, where in case #1 about 70-100ms
$.ajax({
type: "GET",
url: "http://differenthost.com",
data: "{ 'format': 'json' }",
contentType: "application/json",
dataType: "jsonp",
success: function(data) {
// do stuff with data
}
});
Repeating my question, is there any way to force cache even when using ajax with JSONP?
Below you can see my ServiceStack settings.
Globas.asax.vb
Public Class Global_asax
Inherits System.Web.HttpApplication
Public Class HelloAppHost
Inherits AppHostBase
Public Sub New()
MyBase.New("Web Services", GetType(Wrapper).Assembly)
End Sub
Public Overrides Sub Configure(ByVal container As Container)
' Routes
Routes.Add(Of GetData)("/GetData").Add(Of GetData)("/GetData/{*}")
' Cache & Cors
container.Register(Of ICacheClient)(New MemoryCacheClient())
Plugins.Add(New Cors.CorsFeature())
End Sub
End Class
Sub Application_Start(ByVal sender As Object, ByVal e As EventArgs)
Dim apphost = New HelloAppHost()
apphost.Init()
End Sub
End Class
WS.vb
Public Class Wrapper
<EnableCors()>
Public Class WrapperGetData
Inherits Service
Implements IService(Of GetData)
Public Function Execute(ByVal request As GetData) As Object Implements ServiceStack.ServiceHost.IService(Of GetData).Execute
Dim cacheKey As String = "GetDataKey"
Dim expireInTimespan = New TimeSpan(1, 0, 0)
Return Me.RequestContext.ToOptimizedResultUsingCache(
MyBase.Cache,
cacheKey,
expireInTimespan,
Function()
Return request.HandleRequest()
End Function
)
End Function
End Class
End Class