如何从“ http://www.google.com”打印html响应

如何解决如何从“ http://www.google.com”打印html响应

我有一个小操场，如果我尝试请求http://www.bbc.com页面，我将获得一个有效的数据对象，并且可以看到响应数据的文本字符串表示形式。 但是，如果我请求http://www.google.com页面，则会得到一个有效的响应数据对象，但它在utf8中的字符串表示形式（使用String(data: responseData,encoding: .utf8)为nil。 为什么呢？

import Foundation
import PlaygroundSupport

URLCache.shared = URLCache(memoryCapacity: 0,diskCapacity: 0,diskPath: nil)
PlaygroundPage.current.needsIndefiniteExecution = true

let testUrl = "http://www.google.com"
guard let url = URL(string: testUrl) else {
    print("Error: cannot create URL")
    exit(1)
}

let session = URLSession.shared
let urlRequest = URLRequest(url: url)

let task = session.dataTask(with: urlRequest) { (data,response,error) in

    // check for any errors
    guard error == nil else {
        print("error calling GET ")
        print(error!)
        return
    }

    // make sure we got data
    guard let responseData = data else {
        print("Error: did not receive data")
        return
    }

    // check the status code
    guard let httpResponse = response as? HTTPURLResponse else {
        print("Error: It's not a HTTP URL response")
        return
    }


    // Reponse status
    print("Response status code: \(httpResponse.statusCode)")
    print("Response status debugDescription: \(httpResponse.debugDescription)")
    print("Response status localizedString: \(HTTPURLResponse.localizedString(forStatusCode: httpResponse.statusCode))")

    let responseDataStr = String(data: responseData,encoding: .utf8)
  print (" responseData: \(String(describing: responseDataStr)) ")

    PlaygroundPage.current.finishExecution()
}
task.resume()
````