NSURLConnection
NSURLResponse
NSURLSession
NSURLSessionConfiguration
NSURLSessionTask
NSURLSessionDataTask
NSURLSessionUploadTask
NSURLSessionDownloadTask
NSURLRequest
NSURL
NSURLConnection
NSURLResponse
NSURLSession
NSURLSessionConfiguration
NSURLSessionTask
NSURLSessionDataTask
NSURLSessionUploadTask
NSURLSessionDownloadTask
NSURLRequest
NSURL