ios - Progress block with GET and AFNetworking 3.0 is not called -


i have created subclass of afhttpsessionmanager:

class tbnetworkclient: afhttpsessionmanager {     func wordswithcompletionblock(completionblock: tberrorhandler) {          querytype = .words         get("words", parameters: nil, progress: { progress in              print("----------") //this not called @ all, why?              }, success: { sessiondatatask, response in                  completionblock(nil) //success called              }) { sessiondatatask, error in                  completionblock(error)         }     } } 

marked line not called @ all, why?

this definition above method in source code:

public func get(urlstring: string, parameters: anyobject?, progress downloadprogress: ((nsprogress) -> void)?, success: ((nsurlsessiondatatask, anyobject?) -> void)?, failure: ((nsurlsessiondatatask?, nserror) -> void)?) -> nsurlsessiondatatask? 

there note:

@param progress block object executed when download progress updated. note block called on session queue, not main queue.

when print print((sessiondatatask.response as? nshttpurlresponse)?.allheaderfields)

the output following:

optional([server: apache, connection: keep-alive, content-type: text/html, date: fri, 08 jan 2016 08:58:18 gmt, content-encoding: gzip, keep-alive: timeout=1, max=100, content-length: 5663, vary: accept-encoding,user-agent])


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