code: @Test public void connectionPooling() throws Exception {
    server.enqueue(new MockResponse().setBody("abc"));
    server.enqueue(new MockResponse().setBody("def"));
    server.enqueue(new MockResponse().setBody("ghi"));
    server.play();
    client.enqueue(new Request.Builder().url(server.getUrl("/a")).build(),receiver);
    receiver.await(server.getUrl("/a")).assertBody("abc");
    client.enqueue(new Request.Builder().url(server.getUrl("/b")).build(),receiver);
    receiver.await(server.getUrl("/b")).assertBody("def");
    client.enqueue(new Request.Builder().url(server.getUrl("/c")).build(),receiver);
    receiver.await(server.getUrl("/c")).assertBody("ghi");
    assertEquals(0,server.takeRequest().getSequenceNumber());
    assertEquals(1,server.takeRequest().getSequenceNumber());
    assertEquals(2,server.takeRequest().getSequenceNumber());
  }
  