Encrypt Telerik WebResource Querystring

Updated on Aug 24, 2026

You can choose to encrypt the querystring parameters that the Telerik WebResource request has in order to make them unreadable for a third party inspecting the network traffic as of Q3 2015.

This feature affects RadScriptManager and RadStyleSheetManager, and the Telerik.Web.UI.WebResoruce.axd handler.

Example 1: Enable Telerik WebResource querystring encryption.

web.config

<appSettings>
	<add key="Telerik.ScriptManager.EnableHandlerEncryption" value="true"/>
</appSettings>

You must also ensure that the encrypted URL will not be trimmed which will break the request.

Example 2: Increasing the maximum querystring length and URL length for an application:

web.config

. . . .
<httpRuntime maxRequestLength="204800" executionTimeout="36000" maxQueryStringLength="4096"/>
. . . .
<security>
	<requestFiltering>
		<requestLimits maxAllowedContentLength="209715200" maxQueryString="4096" maxUrl="4096" />
	</requestFiltering>
</security>

See Also

• Telerik Control Properties You Can Set in the web.config