Swift POST请求不起作用

通过这种方式，您可以使用POST Web服务：

func webApi() { let request = NSMutableURLRequest(URL: NSURL(string: "your url")!)         request.HTTPMethod = "POST" var string = "access_token=" var postString =       string.stringByAppendingString(FBSDKAccessToken.currentAccessToken().tokenString)     request.HTTPBody = postString.dataUsingEncoding(NSUTF8StringEncoding)     let task = NSURLSession.sharedSession().dataTaskWithRequest(request) { data, response, error in         guard error == nil && data != nil else {   // check for fundamental networking error  print("error=(error)")  return         }         if let httpStatus = response as? NSHTTPURLResponse where httpStatus.statusCode != 200 {// check for http errors  print("statusCode should be 200, but is (httpStatus.statusCode)")  print("response = (response)")         }         let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)         print("responseString = (responseString)")     }     task.resume() }    }//End of webapi function