如何在swift中发送post请求中的正文

import Foundation

// 定义请求的URL
let url = URL(string: "https://example.com/api/endpoint")!

// 创建请求对象
var request = URLRequest(url: url)
request.httpMethod = "POST"

// 设置请求的正文数据
let bodyData = "key1=value1&key2=value2".data(using: .utf8)
request.httpBody = bodyData

// 创建URLSession对象
let session = URLSession.shared

// 发送请求
let task = session.dataTask(with: request) { (data, response, error) in
    if let error = error {
        print("请求出错：\(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 ?? "")")
    }
}

// 启动请求任务
task.resume()