Add URLSession extensions

Author: colemancda

Sources/HTTP/Extensions/URLSession.swift

@@ -0,0 +1,61 @@
+//
+//  URLSession.swift
+//  HTTP
+//
+//  Created by Alsey Coleman Miller on 10/1/25.
+//
+
+import Foundation
+#if canImport(FoundationNetworking)
+import FoundationNetworking
+#endif
+import HTTPTypes
+
+extension URLSession: URLClient {
+    
+    public func data(
+        for request: URLRequest
+    ) async throws(Foundation.URLError) -> (Data, URLResponse) {
+        do {
+            #if canImport(Darwin)
+            if #available(macOS 12, iOS 15.0, tvOS 15, watchOS 8, *) {
+                return try await self.data(for: request, delegate: nil)
+    
+            } else {
+                return try await _data(for: request)
+            }
+            #else
+            return try await _data(for: request)
+            #endif
+        }
+        catch {
+            guard let urlError = error as? Foundation.URLError else {
+                assertionFailure("Invalid error \(error)")
+                throw URLError(.unknown)
+            }
+            throw urlError
+        }
+    }
+}
+
+internal extension URLSession {
+    
+    func _data(for request: URLRequest) async throws -> (Data, URLResponse) {
+        try await withCheckedThrowingContinuation { continuation in
+            let task = self.dataTask(with: request) { data, response, error in
+                if let error = error {
+                    continuation.resume(throwing: error)
+                } else {
+                    continuation.resume(returning: (data ?? .init(), response!))
+                }
+            }
+            task.resume()
+        }
+    }
+}
+
+#if canImport(HTTPTypesFoundation)
+import HTTPTypesFoundation
+
+extension URLSession: HTTPClient { }
+#endif