如何在Swift中创建HTTP请求的本地覆盖？

import Foundation

// 创建URL对象
guard let url = URL(string: "https://example.com/api/endpoint") else {
    print("无效的URL")
    return
}

// 创建请求对象
var request = URLRequest(url: url)
request.httpMethod = "POST" // 设置请求方法
request.setValue("application/json", forHTTPHeaderField: "Content-Type") // 设置请求头

// 设置请求体
let requestBody = ["key": "value"]
do {
    let jsonData = try JSONSerialization.data(withJSONObject: requestBody, options: [])
    request.httpBody = jsonData
} catch {
    print("请求体转换失败: \(error)")
    return
}

// 创建URLSession对象
let session = URLSession.shared

// 创建数据任务
let task = session.dataTask(with: request) { (data, response, error) in
    if let error = error {
        print("请求失败: \(error)")
        return
    }
    
    // 处理响应数据
    if let data = data {
        let responseString = String(data: data, encoding: .utf8)
        print("响应数据: \(responseString ?? "")")
    }
}

// 启动任务
task.resume()