我需要连接到HTTP代理后面的Web服务器。我尝试将URLSessionConfiguration与connectionProxyDictionary一起使用，但似乎忽略了我的代理配置，因为您可以将代理主机值更改为任何值，结果是相同的。

我尝试使用Charles Proxy来调试情况，而不是我需要连接的Proxy，发现请求从未到达，所以我认为我的客户端代码有问题。

import Foundation
class URLSessionProxy: NSObject, URLSessionDelegate {
    func doRequest() {
        let configuration = URLSessionConfiguration.default
        configuration.connectionProxyDictionary = [
            kCFNetworkProxiesHTTPEnable: true,
            kCFNetworkProxiesHTTPProxy: "localhost",
            kCFNetworkProxiesHTTPPort: "8888",
        ]
        var request = URLRequest(url: URL(string: "https://ip.seeip.org/jsonip")!)
        request.addValue("application/json", forHTTPHeaderField: "Accept")
       URLSession(configuration: configuration, delegate: self, delegateQueue: OperationQueue.main)
        .dataTask(with: request, completionHandler: { (data, response, error) in
            if error == nil {
                print("url request = ", request.url?.absoluteString)
                print("headers request = ", request.allHTTPHeaderFields.debugDescription)
                print("response = ", response)
                print("data body = ", String(data: data!, encoding: String.Encoding.utf8.self))
            } else {
                print("error = ", error)
                print(error?.localizedDescription)
            }
        }).resume()
    }
}
URLSessionProxy().doRequest()

在给定的示例中，我希望使用我在本地主机上设置的代理间接连接到ip.seeip.org：8888.​

要点：https://gist.github.com/brunabaudel/90a6873d2c3df6caeb89f8b7afc9adce