OkHttpClient client = new OkHttpClient();
 
    Request request = new Request.Builder()
            .url("http://www.netkiller.cn")
            .build();
 
    Response response = client.newCall(request).execute();
    if (!response.isSuccessful()) {
        throw new IOException("伺服器端錯誤: " + response);
    }
 
    Headers responseHeaders = response.headers();
    for (int i = 0; i < responseHeaders.size(); i++) {
        System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i));
    }
 
    System.out.println(response.body().string());