.build()

  @Test
  fun trailersHttp1() {
    trailers(Protocol.HTTP_1_1)
  }

  @Test
  fun trailersHttp2() {
    trailers(Protocol.HTTP_2)
  }

  private fun trailers(protocol: Protocol) {
    enableProtocol(protocol)

    server.enqueue(
      MockResponse
        .Builder()
        .addHeader("h1", "v1")
        .trailers(headersOf("t1", "v2"))
        .body(protocol, "Hello")

     */
    fun responseBodyComplete(trailers: Headers) {
      if (state == STATE_CLOSED) return
      if (state != STATE_READING_RESPONSE_BODY) throw IllegalStateException("state: $state")

      detachTimeout(timeout)

      this@Http1ExchangeCodec.trailers = trailers
      state = STATE_CLOSED
      if (trailers.size > 0) {
        client?.cookieJar?.receiveHeaders(url, trailers)
      }
    }
  }

  for (pushPromise in pushPromises) {
    result.addPush(pushPromise.wrap())
  }

  result.settings(settings)
  result.status(status)
  result.headers(headers)
  result.trailers(trailers)

  when (socketPolicy) {
    SocketPolicy.EXPECT_CONTINUE, SocketPolicy.CONTINUE_ALWAYS -> {
      result.add100Continue()
    }

    SocketPolicy.UPGRADE_TO_SSL_AT_END -> {
      result.inTunnel()
    }

  private fun serverTruncatesRequestButTrailersCanStillBeRead(http2: Boolean) {
    val mockResponse =
      MockResponse
        .Builder()
        .doNotReadRequestBody()
        .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)
    }

      }

      socket.sleepWhileOpen(response.headersDelayNanos)
      stream.writeHeaders(response.toHttp2Headers(), outFinished, flushHeaders)

      if (trailers.size > 0) {
        stream.enqueueTrailers(trailers)
      }
      pushPromises(stream, request, response.pushPromises)
      if (body != null) {
        socket.sleepWhileOpen(bodyDelayNanos)
        val responseBodySink =

    throwing in 5.0.0, we inadvertently removed the ability for callers to peek the trailers
    (by catching the `IllegalStateException` if they weren't available). This new API restores that
    capability.

 *  Fix: Don't crash on `trailers()` if the response doesn't have a body. We broke [Retrofit] users

  fun readLine(): String {
    val line = source.readUtf8LineStrict(headerLimit)
    headerLimit -= line.length.toLong()
    return line
  }

  /** Reads headers or trailers. */
  fun readHeaders(): Headers {
    val result = Headers.Builder()
    while (true) {
      val line = readLine()
      if (line.isEmpty()) break
      result.addLenient(line)
    }
    return result.build()

    var trailers: Headers = mockResponse.trailers
    mockResponse = mockResponse.clearHeaders()
    mockResponse = mockResponse.addHeader("")
    mockResponse = mockResponse.addHeader("", "")
    mockResponse = mockResponse.addHeaderLenient("", Any())
    mockResponse = mockResponse.setHeader("", Any())
    mockResponse.headers = headersOf()
    mockResponse.trailers = headersOf()

        !"Proxy-Authenticate".equals(fieldName, ignoreCase = true) &&
        !"Proxy-Authorization".equals(fieldName, ignoreCase = true) &&
        !"TE".equals(fieldName, ignoreCase = true) &&
        !"Trailers".equals(fieldName, ignoreCase = true) &&
        !"Transfer-Encoding".equals(fieldName, ignoreCase = true) &&
        !"Upgrade".equals(fieldName, ignoreCase = true)

    /**

      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()
    val source = response.body.source()