Secure            bool      `json:"secure"`
	CertAuthority     string    `json:"certAuthority"`
	ClientCert        string    `json:"clientCert"`
	ClientKey         string    `json:"clientKey"`
	PingInterval      int64     `json:"pingInterval"`
	QueueDir          string    `json:"queueDir"`
	QueueLimit        uint64    `json:"queueLimit"`
	JetStream         struct {
		Enable bool `json:"enable"`
	} `json:"jetStream"`

tls                               (on|off)    set to 'on' to enable TLS
tls_skip_verify                   (on|off)    trust server TLS without verification, defaults to "on" (verify)
ping_interval                     (duration)  client ping commands interval in s,m,h,d. Disabled by default
streaming                         (on|off)    set to 'on', to use streaming NATS server

def slow_sync_stream():
    yield {"n": 1}
    time.sleep(0.3)
    yield {"n": 2}


def test_keepalive_ping_async(monkeypatch: pytest.MonkeyPatch):
    monkeypatch.setattr(fastapi.routing, "_PING_INTERVAL", 0.05)
    with TestClient(keepalive_app) as c:
        response = c.get("/slow-async")
    assert response.status_code == 200
    text = response.text

# Keep-alive comment, per the SSE spec recommendation
KEEPALIVE_COMMENT = b": ping\n\n"

# Seconds between keep-alive pings when a generator is idle.
# Private but importable so tests can monkeypatch it.

     * [will fail with an IOException][java.io.IOException].
     *
     * The default value of 0 disables client-initiated pings.
     */
    fun pingInterval(
      interval: Long,
      unit: TimeUnit,
    ) = apply {
      pingInterval = checkDuration("interval", interval, unit)
    }

    /**
     * Sets the interval between HTTP/2 and web socket pings initiated by this client. Use this to

			TLSSkipVerify:     env.Get(tlsSkipVerifyEnv, kv.Get(target.NATSTLSSkipVerify)) == config.EnableOn,
			TLSHandshakeFirst: env.Get(tlsHandshakeFirstEnv, kv.Get(target.NATSTLSHandshakeFirst)) == config.EnableOn,
			PingInterval:      pingInterval,
			QueueDir:          env.Get(queueDirEnv, kv.Get(target.NATSQueueDir)),
			QueueLimit:        queueLimit,
			RootCAs:           rootCAs,
		}

    closeWebSockets(webSocket, server)
  }

  @Test
  @Throws(Exception::class)
  fun clientPingsServerOnInterval() {
    client =
      client
        .newBuilder()
        .pingInterval(Duration.ofMillis(500))
        .build()
    webServer.enqueue(
      MockResponse
        .Builder()
        .webSocketUpgrade(serverListener)
        .build(),
    )
    val webSocket = newWebSocket()

    builder = builder.readTimeout(Duration.ofSeconds(0L))
    builder = builder.writeTimeout(0L, TimeUnit.SECONDS)
    builder = builder.writeTimeout(Duration.ofSeconds(0L))
    builder = builder.pingInterval(0L, TimeUnit.SECONDS)
    builder = builder.pingInterval(Duration.ofSeconds(0L))
    builder = builder.proxy(Proxy.NO_PROXY)
    builder = builder.proxySelector(NullProxySelector)
    builder = builder.cookieJar(CookieJar.NO_COOKIES)

	public final fun networkInterceptors ()Ljava/util/List;
	public final fun pingInterval (JLjava/util/concurrent/TimeUnit;)Lokhttp3/OkHttpClient$Builder;
	public final fun pingInterval (Ljava/time/Duration;)Lokhttp3/OkHttpClient$Builder;
	public final fun pingInterval-LRDsOJo (J)Lokhttp3/OkHttpClient$Builder;
	public final fun protocols (Ljava/util/List;)Lokhttp3/OkHttpClient$Builder;

    taskFaker.runTasks()
    client.webSocket!!.finishReader()
    client.listener.assertFailure(IOException::class.java, "source is closed")
    assertThat(client.closed).isTrue()
  }

  @Test
  fun pingOnInterval() {
    client.initWebSocket(random, pingIntervalMillis = 500)
    taskFaker.advanceUntil(ns(500L))
    server.processNextFrame() // Ping.
    client.processNextFrame() // Pong.
    taskFaker.advanceUntil(ns(1000L))