ios - Swift Long Polling -


i trying connect url , receive updates it, continuously returns new data in method called http long polling. have found example http long polling in swift isn't working. data returned once doesn't continuously return, , works in curl. here code:

public class longpollingrequest: nsobject {     var globaluserinitiatedqueue: dispatch_queue_t {         return dispatch_get_global_queue(int(qos_class_user_initiated.rawvalue), 0)     }      var globalbackgroundqueue: dispatch_queue_t {         return dispatch_get_global_queue(int(qos_class_background.rawvalue), 0)     }     weak var longpolldelegate: longpollingdelegate?     var request: nsmutableurlrequest?      init(delegate:longpollingdelegate){         longpolldelegate = delegate     }      public func poll(username: string!, token: string!, vehicleid: string!){          let loginstring = nsstring(format: "%@:%@", username, token)         let logindata: nsdata = loginstring.datausingencoding(nsutf8stringencoding)!         let base64loginstring = logindata.base64encodedstringwithoptions([])          // create request         let url = nsurl(string:"https://streaming.vn.teslamotors.com/stream/\(vehicleid)/?values=speed,odometer,soc,elevation,est_heading,est_lat,est_lng,power,shift_state")!         request = nsmutableurlrequest(url: url)         request!.httpmethod = "get"         request!.setvalue("text/json", forhttpheaderfield: "content-type")         request!.setvalue("basic \(base64loginstring)", forhttpheaderfield: "authorization")         poll()     }      private func poll(){         dispatch_async(globalbackgroundqueue) {             self.longpoll()         }     }      private func longpoll() -> void{         autoreleasepool{             do{                 print("starting request: \(request?.httpbody)")                 let urlsession = nsurlsession.sharedsession()                 let datatask = urlsession.datataskwithrequest(self.request!, completionhandler: {                     (data: nsdata?, response: nsurlresponse?, error: nserror?) -> void in                     if( error == nil ) {                         self.longpolldelegate?.datarecieved(data)                         self.poll()                     } else {                         self.longpolldelegate?.errorrecieved(error)                     }                 })                 datatask.resume()             }         }     }


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