.trailers(headersOf("caboose", "xyz"))

    // Trailers always work for HTTP/2, but only for chunked bodies in HTTP/1.
    if (http2) {
      mockResponse.body("abc")
    } else {
      mockResponse.chunkedBody("abc", 1)
    }

    server.enqueue(mockResponse.build())

    val call =
      client.newCall(
        Request(
          url = server.url("/"),
          body = SlowRequestBody,
        ),

        response.trailers()
      }
    }
  }

  private fun MockResponse.Builder.body(
    protocol: Protocol,
    body: String,
  ) = apply {
    when (protocol) {
      Protocol.HTTP_1_1 -> chunkedBody(body, 1024) // Force multiple chunks.
      else -> body(body)
    }
  }

  private fun enableProtocol(protocol: Protocol) {
    if (protocol == Protocol.HTTP_2) {
      enableTls()
      client =

      .assertNoMoreLogs()
  }

  @Test
  fun basicChunkedResponseBody() {
    setLevel(Level.BASIC)
    server.enqueue(
      MockResponse
        .Builder()
        .chunkedBody("Hello!", 2)
        .setHeader("Content-Type", PLAIN)
        .build(),
    )
    val response = client.newCall(request().build()).execute()
    response.body.close()
    applicationLogs

    enableTlsWithTunnel()
    server.protocols = Arrays.asList(Protocol.HTTP_1_1)
    server.enqueue(
      MockResponse
        .Builder()
        .bodyDelay(100, TimeUnit.MILLISECONDS)
        .chunkedBody("Hello!", 2)
        .build(),
    )
    assertSuccessfulEventOrder(anyResponse)
    assertBytesReadWritten(
      eventRecorder,
      CoreMatchers.any(Long::class.java),
      null,

  internal enum class TransferKind {
    CHUNKED {
      override fun setBody(
        response: MockResponse.Builder,
        content: Buffer,
        chunkSize: Int,
      ) {
        response.chunkedBody(content, chunkSize)
      }
    },
    FIXED_LENGTH {
      override fun setBody(
        response: MockResponse.Builder,
        content: Buffer,
        chunkSize: Int,
      ) {

    server.enqueue(
      MockResponse
        .Builder()
        .clearHeaders()
        .addHeader("h1", "v1")
        .addHeader("h2", "v2")
        .chunkedBody("HelloBonjour", 1024)
        .trailers(headersOf("trailers", "boom"))
        .build(),
    )
    val call = client.newCall(Request(server.url("/")))
    val response = call.execute()