1. // okHttpClient 实例
    2.     OkHttpClient okHttpClient = new OkHttpClient();
    3.     // 定义一个request
    4.     Request request = new Request.Builder()
    5.         .url(url)
    6.         .build();
    7.     try {
    8.       // 执行请求
    9.       Response response = okHttpClient.newCall(request).execute();
    10.       // 打印最终响应的地址
    11.       String realUrl = response.request().url().toString();