@Throws(IOException::class)
        override fun writeTo(sink: BufferedSink) {
          delegate().writeTo(uppercaseSink(sink).buffer())
        }
      }
    return request
      .newBuilder()
      .method(request.method, uppercaseBody)
      .build()
  }

  private fun uppercaseSink(sink: Sink): Sink =
    object : ForwardingSink(sink) {
      @Throws(IOException::class)
      override fun write(