asp.net - "Invalid use of response filter" when compressing response from an IHttpHandler -

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i have ihttphandler returning file. when response stream compressed, either automatically using telerik radcompression or explicitly setting filter using 

 context.response.filter = new gzipstream(context.response.filter, compressionmode.compress);

the response returned browser correct @ end of response html. html contains exception:

 [httpexception (0x80004005): invalid use of response filter]    system.web.httpresponsestreamfiltersink.verifystate() +3928894    system.web.httpresponsestreamfiltersink.write(byte[] buffer, int32 offset, int32 count) +28    system.io.compression.deflatestream.dispose(boolean disposing) +363    system.io.stream.close() +28    system.io.compression.gzipstream.dispose(boolean disposing) +63    system.io.stream.close() +28    system.io.compression.deflatestream.dispose(boolean disposing) +595    system.io.stream.close() +28    system.io.compression.gzipstream.dispose(boolean disposing) +63    system.io.stream.close() +28    system.web.httpwriter.filterintegrated(boolean finalfiltering, iis7workerrequest wr) +754    system.web.httpresponse.filteroutput() +121    system.web.callfilterexecutionstep.system.web.httpapplication.iexecutionstep.execute() +174

if make sure response not compressed, response contains no exception.

what's that?

it seems related this: gzipstream cutting off last part of xml

i removed compression module , seem now.


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