Telerik Async Upload fails in IE11 on load balancer

[ss]

We are using telerik control in our app with windows authentication and upload fails in load balancer with ie11. With Compatibility view it doesn't work either.     

One of the solution that has been posted in the online is to issue a HEAD or a GET request prior to the POST.

How can this be done with the Telerik control?

 

Thanks!

[Veselin Tsvetanov]

Hello,

As the specified unexpected behavior could be related to a known bug in Internet explorer, I would suggest you to try disabling the FileAPI that RadAsyncUpload uses by placing the following script on your page:

<script type="text/javascript">
    Telerik.Web.UI.RadAsyncUpload.Modules.FileApi.isAvailable = function () {
        return false;
    }
</script>

Regards,
Veselin Tsvetanov
Telerik

[ss]

Thanks for your response. 

Can you please explain what .isAvailable will do and how is it going to help us solve the problem?

Thanks again!

[Veselin Tsvetanov]

Hi,

File.Api.isAvailable tells the RadAsyncUpload whether the browser supports the Web File API. With the suggested override it will always return false, so the RadAsyncUpload will use one of the other available Upload modules.

Regards,
Veselin Tsvetanov
Telerik