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duplicate antiforgerytoken in request

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Tom asked on 17 Nov 2012, 11:58 AM

I implemented an MVC3 project with a controller that handles ajax POST requests in JSON format. The controller action requires an AntiForgeryToken.

Now I have a problem with a kendo datasource request posted to the server. I followed the samples for the dataSource configuration:

dataSource: new{
                type: "json",
                transport: {
                    read: {
                        url: "GetZones",
                        dataType: "json",
                        type: "POST",
                        contentType: "application/json; charset=utf-8",
                        data: {
                            __RequestVerificationToken: $("input[name=__RequestVerificationToken]").val()
                        } //sendAntiForgery()
                    parameterMap: function (options) {
                        return JSON.stringify(options);

However in fiddler I get the following error:

{"error":"Invalid JSON primitive: __RequestVerificationToken=cVKwXnuusO7LVzfoTYk2FD4S5BhSstIULlN0uzspliMOByr/OFRMpbaeLT4i84lpqZZPuzNyUzuhqULNEA/WyljOuD17gycOs2yQGfNlHq1GrX7/QcW3l0RC30RAXA9ruyLRuvCBLNOASqsMUSBb4wIyzxMj4mLrZZNdqk4JWyo=."}

I found out that the token is send out twice as you can see in the following request body:


The first __RequestVerificationToken is in JSON format, but the appended 2nd __RequestVerificationToken is not and leads to the error of the MVC service.

How can I suppress the 2nd instance?

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Telerik team
answered on 20 Nov 2012, 02:46 PM
Hello Thomas,

I'm afraid that I'm not sure what may be the cause for the behavior you have described. Therefore, please provide a small runnable sample in which this behavior can be observed.

All the best,
the Telerik team
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