Alamore-test-2.swift

import Foundation
import Dispatch

class ProxyURLProtocol: URLProtocol {

    static var session: URLSession!

    struct PropertyKeys {
        static let handledByForwarderURLProtocol = "HandledByProxyURLProtocol"
    }

    var activeTask: URLSessionTask?

    override class func canInit(with request: URLRequest) -> Bool {
        return true
    }

    override class func canonicalRequest(for request: URLRequest) -> URLRequest {
        return request
    }

    override func startLoading() {
        let urlRequest = URLRequest(url: URL(string: "http://httpbin.org/get")!) 
        //session = Foundation.URLSession(configuration: .default, delegate: self, delegateQueue: nil)
        activeTask = ProxyURLProtocol.session.dataTask(with: urlRequest)
        activeTask?.resume()
    }

    override func stopLoading() {
        activeTask?.cancel()
    }
}

extension ProxyURLProtocol: URLSessionDataDelegate {

    func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
        client?.urlProtocol(self, didLoad: data)
    }

    func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
        if let response = task.response {
            client?.urlProtocol(self, didReceive: response, cacheStoragePolicy: .notAllowed)
        }

        client?.urlProtocolDidFinishLoading(self)
    }
}

let urlRequest = URLRequest(url: URL(string: "http://google.com")!)
let configuration = URLSessionConfiguration.default
configuration.protocolClasses = [ProxyURLProtocol.self]
let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: nil)
ProxyURLProtocol.session = session
let task = session.dataTask(with: urlRequest) 
task.resume()
dispatchMain()