swift - Error: "HttpGetData.Type doesn't have a member named 'url'" -

i want test http post, shows error:

httpgetdata.type 'doesn't have member named 'url'

when type on viewcontroller works?

is initialize problem?

import foundation public class httpgetdata{      let url = nsurl( string: "https://210.61.209.194:8443/smarttvwebservicetopmsoapi/")      let request = nsmutableurlrequest((url : url)!)     request.httpmethod = "post"     let poststring : string = "id=13&name=jack"     request.httpbody = poststring.datausingencoding(nsutf8stringencoding)     let task = nsurlsession.sharedsession().datataskwithrequest(request) {         data, response, error in          if error != nil {             println("error=\(error)")             return         }          println("response = \(response)")          let responsestring = nsstring(data: data, encoding: nsutf8stringencoding)         println("responsestring = \(responsestring)")     }     task.resume()  }