Encrypt Telerik WebResource Querystring

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.

<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:

. . . .
<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

Here is the whole web.config file:

<?xml version="1.0"?>
<configuration>
  <appSettings>
    <add key="Telerik.ScriptManager.EnableHandlerEncryption" value="true"/>
    <add key="Telerik.Skin" value="Bootstrap" />
    <add key="Telerik.ScriptManager.TelerikCdn" value="Disabled" />
    <add key="Telerik.StyleSheetManager.TelerikCdn" value="Disabled" />
    <add key="Telerik.Web.UI.RenderMode" value="lightweight" />
  </appSettings>
  <system.web>
    <compilation debug="false" targetFramework="4.8.1" />
    <httpRuntime targetFramework="4.8.1" maxRequestLength="204800" executionTimeout="36000" maxQueryStringLength="4096"/>
    <pages>
      <controls>
        <add tagPrefix="telerik" namespace="Telerik.Web.UI" assembly="Telerik.Web.UI" />
      </controls>
    </pages>
    <httpHandlers>

      <add path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" validate="false" />
      <add path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" validate="false" />
      <add path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" validate="false" />
      <add path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" validate="false" />
      <add path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" validate="false" />
    </httpHandlers>
  </system.web>

  <system.webServer>
    <security>
      <requestFiltering>
        <requestLimits maxAllowedContentLength="209715200" maxQueryString="4096" maxUrl="4096" />
      </requestFiltering>
    </security>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>

      <remove name="ChartImage_axd" />
      <add name="ChartImage_axd" path="ChartImage.axd" type="Telerik.Web.UI.ChartHttpHandler" verb="*" preCondition="integratedMode" />
      <remove name="Telerik_Web_UI_SpellCheckHandler_axd" />
      <add name="Telerik_Web_UI_SpellCheckHandler_axd" path="Telerik.Web.UI.SpellCheckHandler.axd" type="Telerik.Web.UI.SpellCheckHandler" verb="*" preCondition="integratedMode" />
      <remove name="Telerik_Web_UI_DialogHandler_aspx" />
      <add name="Telerik_Web_UI_DialogHandler_aspx" path="Telerik.Web.UI.DialogHandler.aspx" type="Telerik.Web.UI.DialogHandler" verb="*" preCondition="integratedMode" />
      <remove name="Telerik_RadUploadProgressHandler_ashx" />
      <add name="Telerik_RadUploadProgressHandler_ashx" path="Telerik.RadUploadProgressHandler.ashx" type="Telerik.Web.UI.RadUploadProgressHandler" verb="*" preCondition="integratedMode" />
      <remove name="Telerik_Web_UI_WebResource_axd" />
      <add name="Telerik_Web_UI_WebResource_axd" path="Telerik.Web.UI.WebResource.axd" type="Telerik.Web.UI.WebResource" verb="*" preCondition="integratedMode" />
    </handlers>
  </system.webServer>
</configuration>

You can find more information in the Security article and Setting the web.config File articles.