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    return undef;
  }

  $url = "$testpath/bigbinary.dat";
  open OUT, ">bigbinary.dat";
  $res = $http->request($url, \&savetofile, OUT);
  close OUT;

=item set_callback ( $functionref, $dataref )

At various stages of the request, callbacks may be used to modify the
behaviour or to monitor the status of the request.  These work like the
$data_callback parameter to request(), but are more verstaile.  Using
set_callback disables $data_callback in request()

The callbacks are called as:
  callback ( $self, $phase, $dataref, $cbargs )

The current phases are:

  connect - connection has been established and headers are being
            transmitted.

  content-length - return value is used as the content-length.  If undef,
            and prepare_post() was used, the content length is
            calculated.