ดึงอัตราแลกเปลี่ยนใน Swift ด้วย URLSession

import Foundationfinal class NoRedirects: NSObject, URLSessionTaskDelegate {    func urlSession(_ session: URLSession, task: URLSessionTask, willPerformHTTPRedirection response: HTTPURLResponse, newRequest request: URLRequest, completionHandler: @escaping (URLRequest?) -> Void) {        completionHandler(nil)    }}struct Latest: Decodable {    let base: String    let source: String    let marketSession: String    let dataUpdatedAt: String    let rates: [String: Decimal]}struct ExchangeRateClient {    let session: URLSession    let apiKey: String?    func latest(base: String) async throws -> Latest {        let normalizedBase = base.uppercased()        guard normalizedBase.count == 3, normalizedBase.allSatisfy({ $0.isASCII && $0.isLetter }) else {            throw URLError(.badURL)        }        guard var components = URLComponents(string: "https://api.exchangerate.dev/v1/latest/\(normalizedBase)") else {            throw URLError(.badURL)        }        components.queryItems = [URLQueryItem(name: "symbols", value: "EUR,GBP,JPY")]        guard let url = components.url else { throw URLError(.badURL) }        var request = URLRequest(url: url)        request.timeoutInterval = 10        if let apiKey { request.setValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization") }        let (data, response) = try await session.data(for: request)        guard let http = response as? HTTPURLResponse, (200..<300).contains(http.statusCode) else {            throw URLError(.badServerResponse)        }        let decoder = JSONDecoder()        decoder.keyDecodingStrategy = .convertFromSnakeCase        return try decoder.decode(Latest.self, from: data)    }}

let key = ProcessInfo.processInfo.environment["EXCHANGERATE_API_KEY"]let session = URLSession(configuration: .ephemeral, delegate: NoRedirects(), delegateQueue: nil)let client = ExchangeRateClient(    session: session,    apiKey: key)let latest = try await client.latest(base: "USD")print(latest.rates["EUR"] as Any, latest.source, latest.dataUpdatedAt)