Retrieve the progress information for $request.
The progress info may look like follows:
object(stdClass)#6 (7) {
["started"]=>
bool(true)
["finished"]=>
bool(true)
["info"]=>
string(8) "finished"
["dltotal"]=>
float(0)
["dlnow"]=>
float(33561)
["ultotal"]=>
float(0)
["ulnow"]=>
float(0)
}