OpenAIStream with NextJS Page router

[baroxdev]

I've tried return StreamingTextResponse but it not work. Did I make mistake?

export default async function handler(req, res) {
  const { method } = req;

  switch (method) {
    case 'POST': {
      let { prompt } = JSON.parse(req.body);
      const messages = [
        {
          role: 'system',
          content:
            'You are an AI writing assistant that continues existing text based on context from prior text. ' +
            'Give more weight/priority to the later characters than the beginning ones. ' +
            'Limit your response to no more than 200 characters, but make sure to construct complete sentences.',
        },
        {
          role: 'user',
          content: prompt,
        },
      ];
      const response = await openAIService.chat({
        messages: messages,
        stream: false,
      });

      const stream = OpenAIStream(response);

      return new StreamingTextResponse(stream);
// or:   return streamToResponse(stream, res);
    }
    default: {
      res.status(400).json({ message: 'Action not found' });
    }
  }
}```