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Goal: Allow an iOS/macOS app to connect to a backend that uses a self‑signed TLS certificate while ensuring that hostname verification remains intact and the connection is not vulnerable to man‑in‑the‑middle attacks. Constraint: URLSession’s built‑in validation rejects self‑signed certificates unless the app provides a delegate that evaluates the server’s Se
Learn how to wrap a URLSession GET request in a Swift function that returns Result<Data, Error>, validates HTTP status, handles errors, and provides recovery strategies.
When iOS 15 and macOS 12 raised the default HTTPMaximumConnectionsPerHost from 4 to 6, developers observed intermittent latency spikes and timeouts during burst traffic. The goal is to determine whether the per‑host connection pool is truly isolated per URLSession or if multiple sessions share sockets, especially when using background sessions or URLSessionS
Uncertain Callback Sequencing When a URLSession data task is cancelled via task.cancel() or by cancelling the surrounding Task in Swift 5.5’s async/await API, the underlying CFNetwork stack may still invoke delegate methods with partial data. The documentation does not specify whether urlSession(_:task:didCompleteWithError:) is guaranteed to fire after all u
URLSession’s httpMaximumConnectionsPerHost setting, introduced in iOS 17, allows developers to increase the number of simultaneous TCP connections a host can use. The default remains four, but the new dynamic configuration can raise this limit per host. Despite the option, Apple’s documentation does not guarantee that higher values will lower latency; the sy
Implementing SSL pinning in a Swift application requires a choice between utilizing the native URLSessionDelegate for manual trust evaluation or integrating a third-party library like TrustKit. Using the native urlSession(_:didReceive:completionHandler:) method allows for direct control via SecTrustRef and eliminates external dependencies, reducing binary si
Goal When a Swift Task is cancelled, ensure that the associated URLSessionDataTask is terminated immediately to prevent unnecessary network usage and battery drain. Challenge URLSession’s data(for:) overload forwards cancellation only when explicitly used; otherwise cancelling the enclosing Task does not affect the underlying network task. Similarly, Combine
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