*/
  @Throws(IOException::class)
  private fun cacheWritingResponse(
    cacheRequest: CacheRequest?,
    response: Response,
  ): Response {
    // Some apps return a null body; for compatibility we treat that like a null cache request.
    if (cacheRequest == null) return response
    val cacheBodyUnbuffered = cacheRequest.body()

    val source = response.body.source()