OkHttp and application termination

I use OkHttp to perform an asynchronous request:

 public class Main { private static final OkHttpClient client = new OkHttpClient(); public static void main(String[] args) throws Exception { run(); } public static void run() throws Exception { Request request = new Request.Builder() .url("http://publicobject.com/helloworld.txt") .build(); client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { e.printStackTrace(); } @Override public void onResponse(Call call, Response response) throws IOException { if (!response.isSuccessful()) throw new IOException("Unexpected code " + response); Headers responseHeaders = response.headers(); for (int i = 0, size = responseHeaders.size(); i < size; i++) { System.out.println(responseHeaders.name(i) + ": " + responseHeaders.value(i)); } System.out.println(response.body().string()); } }); } } 

As a result of executing this code, the contents of the response from the server are output to the console, but after that the application does not terminate, although I would like it to complete.

As far as I understand, this is due to the fact that in the process OkHttp creates a stream that, for some reason, does not end automatically.

Question two:

Why is the application not terminating?

How to shut down the application correctly after working out one of the callbacks? System.exit(0); or?