ios - How can I do an HTTP Post before reading the JSON? -

i reading json url , has been working correctly. code:

@iboutlet weak var profilescell: uitableview!  let cellspacing: cgfloat = 50  var names = [string]() var posts = [string]() var locations = [string]() var votes = [string]() var comments = [string]()  override func viewdidload() {     super.viewdidload()     profilescell.datasource = self      let url:url = url(string: "http://"+connection_string+":8000/profile_view")!      urlsession.shared.datatask(with:url, completionhandler: {(data, response, error) in         if error != nil {       print(error)         } else {             {                 let parseddata = try jsonserialization.jsonobject(with: data!, options: .allowfragments) as! [string:any]                 if let profile = parseddata["profile"]  as! [anyobject]?                 {                     stream in profile {                         if let fullname = stream["fullname"] as? string {                             self.names.append(fullname)                         }                          if let post = stream["post"] as? string {                             self.posts.append(post)                         }                          if let location = stream["location"] as? string {                             self.locations.append(location)                         }                          if let vote = stream["votes"] as? string {                             self.votes.append(vote.appending(" votes"))                         }                          if let comment = stream["comments"] as? string {                             self.comments.append(comment.appending(" comments"))                         }                          dispatchqueue.main.async {                             self.profilescell.reloaddata()                         }                     }                 }             } catch let error nserror {                 print(error)             }         }     }).resume() } 

that code above correctly parses json , data returned tableview. want http post before reading json , parameter name profile_id , know wrong in code because if html form parameter, things work correctly.

this new code have:

@iboutlet weak var profilescell: uitableview!  let cellspacing: cgfloat = 50  var names = [string]() var posts = [string]() var locations = [string]() var votes = [string]() var comments = [string]()  override func viewdidload() {     super.viewdidload()     profilescell.datasource = self      let url:url = url(string: "http://"+connection_string+":8000/profile_view")! let ss = "32"      var request = urlrequest(url:url)     let paramstring = "profile_id=\(ss)"      request.httpmethod = "post"      request.cachepolicy = nsurlrequest.cachepolicy.reloadignoringcachedata     request.httpbody = paramstring.data(using: .utf8)      urlsession.shared.datatask(with:url, completionhandler: {(data, response, error) in         if error != nil {        print(error)         } else {             {                 let parseddata = try jsonserialization.jsonobject(with: data!, options: .allowfragments) as! [string:any]                 if let profile = parseddata["profile"]  as! [anyobject]?                 {                     stream in profile {                         if let fullname = stream["fullname"] as? string {                             self.names.append(fullname)                         }                          if let post = stream["post"] as? string {                             self.posts.append(post)                         }                          if let location = stream["location"] as? string {                             self.locations.append(location)                         }                          if let vote = stream["votes"] as? string {                             self.votes.append(vote.appending(" votes"))                         }                          if let comment = stream["comments"] as? string {                             self.comments.append(comment.appending(" comments"))                         }                          dispatchqueue.main.async {                             self.profilescell.reloaddata()                         }                     }                 }             } catch let error nserror {                 print(error)             }         }     }).resume() } 

now code url still being hit profile_id showing null though have hardcoded number 32. message displayed:

error domain=nscocoaerrordomain code=3840 "no value." userinfo={nsdebugdescription=no value.}