# init(configuration:delegate:delegateQueue:) Creates a session with the specified session configuration, delegate, and operation queue. ``` init(configuration: URLSessionConfiguration, delegate: (any URLSessionDelegate)?, delegateQueue queue: OperationQueue?) ``` ## Parameters `configuration` A configuration object that specifies certain behaviors, such as caching policies, timeouts, proxies, pipelining, TLS versions to support, cookie policies, and credential storage. See [`URLSessionConfiguration`](/documentation/Foundation/URLSessionConfiguration) for more information. `delegate` A session delegate object that handles requests for authentication and other session-related events. This delegate object is responsible for handling authentication challenges, for making caching decisions, and for handling other session-related events. If `nil` , the class should be used only with methods that take completion handlers. > Important: > The session object keeps a strong reference to the delegate until your app exits or explicitly invalidates the session. If you do not invalidate the session by calling the ``doc://com.apple.foundation/documentation/Foundation/URLSession/invalidateAndCancel()`` or ``doc://com.apple.foundation/documentation/Foundation/URLSession/finishTasksAndInvalidate()`` method, your app leaks memory until it exits. `queue` An operation queue for scheduling the delegate calls and completion handlers. The queue should be a serial queue, in order to ensure the correct ordering of callbacks. If `nil`, the session creates a serial operation queue for performing all delegate method calls and completion handler calls. ## Discussion --- 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)