code: @Test public void getKeepAlive() throws Exception {
    MockWebServer server=new MockWebServer();
    server.enqueue(new MockResponse().setBody("ABC"));
    server.play();
    HttpURLConnection connection1=client.open(server.getUrl(""));
    connection1.setReadTimeout(100);
    InputStream input=connection1.getInputStream();
    assertEquals("ABC",readAscii(input,Integer.MAX_VALUE));
    server.shutdown();
    try {
      HttpURLConnection connection2=client.open(server.getUrl(""));
      connection2.setReadTimeout(100);
      connection2.getInputStream();
      fail();
    }
   catch (  ConnectException expected) {
    }
  }
  