Use an URLSessionConfiguration that can be configured by app

README.md

@@ -30,6 +30,12 @@ extension URLCache {
 
 Remember when setting the cache the response (in this case our image) must be no larger than about 5% of the disk cache (See [this discussion](https://developer.apple.com/documentation/foundation/nsurlsessiondatadelegate/1411612-urlsession#discussion)).
 
+You can also modify the `URLSessionConfiguration` used by `CachedAsyncImage` via `URLSessionConfiguration.cachedAsyncImage`:
+
+```swift
+URLSessionConfiguration.cachedAsyncImage.protocolClasses = [MyContentProtocol.self]
+```
+
 ## Installation
 
 1. In Xcode, open your project and navigate to **File** → **Swift Packages** → **Add Package Dependency...**

Sources/CachedAsyncImage/CachedAsyncImage.swift

@@ -294,7 +294,7 @@ public struct CachedAsyncImage<Content>: View where Content: View {
     ///   - content: A closure that takes the load phase as an input, and
     ///     returns the view to display for the specified phase.
     public init(urlRequest: URLRequest?, urlCache: URLCache = .shared, scale: CGFloat = 1, transaction: Transaction = Transaction(), @ViewBuilder content: @escaping (AsyncImagePhase) -> Content) {
-        let configuration = URLSessionConfiguration.default
+        let configuration = URLSessionConfiguration.cachedAsyncImage
         configuration.urlCache = urlCache
         self.urlRequest = urlRequest
         self.urlSession =  URLSession(configuration: configuration)
@@ -404,3 +404,21 @@ private extension URLSession {
         return (data, response, controller.metrics!)
     }
 }
+
+// MARK: - URLSessionConfiguration
+
+@MainActor
+private var urlSessionConfig = URLSessionConfiguration.default
+extension URLSessionConfiguration {
+
+    /// Default configuration used by `CachedAsyncImage`.
+    @MainActor
+    public static var cachedAsyncImage: URLSessionConfiguration {
+        get {
+            urlSessionConfig
+        }
+        set {
+            urlSessionConfig = newValue
+        }
+    }
+}