internal void ReleaseResources ()
{
Stream stream;
if (input_stream != null){
stream = input_stream;
input_stream = null;
try {
stream.Close ();
} catch {}
}
if (request_file != null) {
stream = request_file;
request_file = null;
try {
stream.Close ();
} catch {}
}
}
#if NET_4_0