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

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