ios - HTTP request in swift 3 Xcode 8.3 -

i getting stuck http request.it did not show error.compiler reads first 2 lines , skip code "task.resume()".i fetching data same code on other view controller creats problem here

func getcustomers() {     let url = nsurl(string: "myurl.com")     let task = urlsession.shared.datatask(with: url! url) {         (data, response, error) in          guard let _:data = data, let _:urlresponse = response  , error == nil else {             print("error: \(string(describing: error))")              return         }                 {             self.getcustomersarray = [getcustomers]()             //json parsing             if let data = data,                  let json = try jsonserialization.jsonobject(with: data) as? [string: any]             {                 let results = json["result"] as? [[string : any]]                  let getcustomersobject:getcustomers = getcustomers()                 result in results!                 {                     getcustomersobject.activityprefix = (result["activityprefix"] as? string)!                     getcustomersobject.customerid = (result["customerid"] as? string)!                     getcustomersobject.customername = (result["customername"] as? string)!                     getcustomersobject.tfmcustomerid = (result["tfmcustomerid"] as? string)!                     getcustomersobject.shortname = (result["shortname"] as? string)!                     getcustomersobject.userrights = (result["userrights"] as? int)!                      self.totalcustomers += self.totalcustomers                 }                 self.customername = getcustomersobject.customername              }         }//end         catch         {          }     }      task.resume() } 

using block get/post/put/delete:

 let request = nsmutableurlrequest(url: url(string: "your api url here" ,param: param))!,         cachepolicy: .useprotocolcachepolicy,         timeoutinterval:"your request timeout time in seconds")     request.httpmethod = "get"     request.allhttpheaderfields = headers as? [string : string]       let session = urlsession.shared      let datatask = session.datatask(with: request urlrequest) {data,response,error in         let httpresponse = response as? httpurlresponse          if (error != nil) {          print(error)          } else {          print(httpresponse)          }          dispatchqueue.main.async {            //update ui here         }      }     datatask.resume() 

i think dont mention line request.httpmethod = "get"