class UppercaseResponseInterceptor : Interceptor {
  @Throws(IOException::class)
  override fun intercept(chain: Chain): Response {
    return uppercaseResponse(chain.proceed(chain.request()))
  }

  private fun uppercaseResponse(response: Response): Response {
    val uppercaseBody: ResponseBody =
      object : ForwardingResponseBody(response.body) {
        override fun source(): BufferedSource {