# Legacy URL Loading Systems Migrate your code away from using these legacy objects. ## Topics ### URL Connection [`NSURLConnection`](/documentation/Foundation/NSURLConnection) An object that enables you to start and stop URL requests. [`NSURLConnectionDelegate`](/documentation/Foundation/NSURLConnectionDelegate) A protocol that delegates of a URL connection implement to receive status about and provide feedback to the connection object. [`NSURLConnectionDataDelegate`](/documentation/Foundation/NSURLConnectionDataDelegate) A protocol that most delegates of a URL connection implement to receive data associated with the connection. [`NSURLConnectionDownloadDelegate`](/documentation/Foundation/NSURLConnectionDownloadDelegate) A protocol that delegates of a URL connection created with Newsstand Kit implement to receive data associated with a download. ### URL Download [`NSURLDownload`](/documentation/Foundation/NSURLDownload) An object that downloads a resource asynchronously and saves the data to a file. [`NSURLDownloadDelegate`](/documentation/Foundation/NSURLDownloadDelegate) A protocol that URL download delegates implement to interact with a URL download request. ### URL Handle [`NSURLHandle`](/documentation/Foundation/NSURLHandle) An object that accesses and manages resource data indicated by a URL. [`NSURLHandleClient`](/documentation/Foundation/NSURLHandleClient) The interface implemented by URL handle clients. ### URL Authentication Challenge Sender [`URLAuthenticationChallengeSender`](/documentation/Foundation/URLAuthenticationChallengeSender) The `URLAuthenticationChallengeSender` protocol represents the interface that the sender of an authentication challenge must implement. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)