HTTPSURLLoader.swift

import Foundation

actor HTTPSURLLoader {
    enum Error: Swift.Error {
        case unexpectedScheme(String?)
        case unexpectedResponseType(URLResponse)
    }
    
    private(set) var tasks: [URLRequest: Task<(Data, HTTPURLResponse), any Swift.Error>] = [:]

    func load(_ request: URLRequest, session: URLSession) async throws -> (Data, HTTPURLResponse) {
        defer {
            tasks[request] = nil
        }
        
        if let task = tasks[request] {
            return try await task.value
        }
        
        let task = Task {
            guard request.url?.scheme == "https" else {
                throw Error.unexpectedScheme(request.url?.scheme)
            }
            
            let (data, response) = try await session.data(for: request)
            
            guard let httpResponse = response as? HTTPURLResponse else {
                throw Error.unexpectedResponseType(response)
            }
            
            return (data, httpResponse)
        }
        
        tasks[request] = task
        
        return try await task.value
    }
}