chat.loadMore();
  assertEquals("hello, world!", chat.messages());

  chat.loadMore();
  chat.loadMore();
  assertEquals(""
      + "hello, world!\n"
      + "sup, bra?\n"
      + "yo dog", chat.messages());

  // Optional: confirm that your app made the HTTP requests you were expecting.
  RecordedRequest request1 = server.takeRequest();
  assertEquals("/v1/chat/messages/", request1.getPath());

 *  New: `OkHttpClient.Builder.minWebSocketMessageToCompress()` configures a threshold for
    compressing outbound web socket messages. Configure this with 0L to always compress outbound
    messages and `Long.MAX_VALUE` to never compress outbound messages. The default is 1024L which
    compresses messages of size 1 KiB and larger. (Inbound messages are compressed or not based on
    the web socket server's configuration.)

This [sample factory](https://github.com/square/okhttp/blob/master/samples/guide/src/main/java/okhttp3/recipes/PrintEvents.java) creates a unique ID for each call and uses that ID to differentiate calls in log messages.

```java
class PrintingEventListener extends EventListener {
  public static final Factory FACTORY = new Factory() {
    final AtomicLong nextCallId = new AtomicLong(1L);

  }

  fun assertFailure(
    cls: Class<out IOException?>?,
    vararg messages: String,
  ) {
    val event = nextEvent() as Failure
    assertThat(event.response).isNull()
    assertThat(event.t.javaClass).isEqualTo(cls)
    if (messages.isNotEmpty()) {
      assertThat(messages).contains(event.t.message)
    }
  }

  fun assertFailure() {
    nextEvent() as Failure
  }

  ) {
  }

  /**
   * Invoked when the remote peer has indicated that no more incoming messages will be transmitted.
   */
  open fun onClosing(
    webSocket: WebSocket,
    code: Int,
    reason: String,
  ) {
  }

  /**
   * Invoked when both peers have indicated that no more messages will be transmitted and the
   * connection has been successfully released. No further calls to this listener will be made.

    }
  }

  /**
   * Attempts to remove a single frame from a queue and send it. This prefers to write urgent pongs
   * before less urgent messages and close frames. For example it's possible that a caller will
   * enqueue messages followed by pongs, but this sends pongs followed by messages. Pongs are always
   * written in the order they were enqueued.
   *

#### Http2Writer

Socket writes are guarded by the Http2Writer. Only one stream can write at a time so that messages are not interleaved. Writes are either made by application-layer threads or the do-stuff-later pool.

### Holding multiple locks

        "Expected exception type among ${allowedExceptionTypes.contentToString()}, got $failure",
      ).isTrue()
    }

  fun assertFailure(vararg messages: String) =
    apply {
      assertThat(failure, "No failure found").isNotNull()
      assertThat(messages).contains(failure!!.message)
    }

  fun assertFailureMatches(vararg patterns: String) =
    apply {
      val message = failure!!.message!!

        .build(),
    )
    val response = getResponse(newRequest("/"))
    assertThat(response.protocol).isEqualTo(Protocol.HTTP_1_1)
  }

  /** For example, empty Protobuf RPC messages end up as a zero-length POST.  */
  @Test
  fun zeroLengthPost() {
    zeroLengthPayload("POST")
  }

  @Test
  fun zeroLengthPost_HTTP_2() {
    enableProtocol(Protocol.HTTP_2)

    fun assertLogEqual(expected: String) =
      apply {
        assertThat(index, "No more messages found")
          .isLessThan(logs.size)
        assertThat(logs[index++]).isEqualTo(expected)
        return this
      }

    fun assertLogMatch(regex: Regex) =
      apply {
        assertThat(index, "No more messages found")
          .isLessThan(logs.size)
        assertThat(logs[index++])