fun readResponseHeaders(expectContinue: Boolean): Response.Builder?

  @Throws(IOException::class)
  fun reportedContentLength(response: Response): Long

  @Throws(IOException::class)
  fun openResponseBodySource(response: Response): Source

  /** Returns the trailers after the HTTP response if they're ready. May be empty. */
  @Throws(IOException::class)
  fun peekTrailers(): Headers?

  /**

    }
  }

  override fun reportedContentLength(response: Response): Long =
    when {
      !response.promisesBody() -> 0L
      else -> response.headersContentLength()
    }

  override fun openResponseBodySource(response: Response): Source = stream!!.source

  override fun peekTrailers(): Headers? = stream!!.peekTrailers()

  override fun cancel() {
    canceled = true
    stream?.closeLater(ErrorCode.CANCEL)

  fun openResponseBody(response: Response): ResponseBody {
    try {
      val contentType = response.header("Content-Type")
      val contentLength = codec.reportedContentLength(response)
      val rawSource = codec.openResponseBodySource(response)
      val source =
        ResponseBodySource(
          delegate = rawSource,
          contentLength = contentLength,
          isSocket = false,
        )

    when {
      !response.promisesBody() -> 0L
      response.isChunked -> -1L
      else -> response.headersContentLength()
    }

  override fun openResponseBodySource(response: Response): Source =
    when {
      !response.promisesBody() -> newFixedLengthSource(response.request.url, 0)
      response.isChunked -> newChunkedSource(response.request.url)
      else -> {