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HTML5 Viewer Export Operations Fail with ERR_CONNECTION_RESET HTTP Error 504


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Export operations initiated through the HTML5 Viewer result in ERR_CONNECTION_RESET ERROR 504 when Telerik UI for ASP.NET AJAX RadCompression is enabled.

Fidler's raw response is:
[Fiddler] ReadResponse() failed: The server did not return a complete response for this request. Server returned 0 bytes.                                                                                                                                                                                                                                                                                                                                                                                                       


The RadCompression must be disabled for request to the Reporting REST service (WebAPI based) in order documents bytes to be received by the client(viewer).

    <sectionGroup name="telerik.web.ui">
      <section name="radCompression" type="Telerik.Web.UI.RadCompressionConfigurationSection, Telerik.Web.UI, PublicKeyToken=121fae78165ba3d4" allowDefinition="MachineToApplication" requirePermission="false"/>

        <add handlerPath="api/reports/" matchExact="false"/>

where the handlerPath should point to the Reporting REST Service - the HTML5 Viewer's serviceUrl.

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