// Connection is upgrading, but we need to ensure interceptors see a non-null response body.
          response.stripBody()
        } else {
          response.newBuilder()
            .body(exchange.openResponseBody(response))
            .build()
        }
      if ("close".equals(response.request.header("Connection"), ignoreCase = true) ||
        "close".equals(response.header("Connection"), ignoreCase = true)
      ) {

      trackFailure(e)
      throw e
    }
  }

  fun responseHeadersEnd(response: Response) {
    eventListener.responseHeadersEnd(call, response)
  }

  @Throws(IOException::class)
  fun openResponseBody(response: Response): ResponseBody {
    try {
      val contentType = response.header("Content-Type")
      val contentLength = codec.reportedContentLength(response)