Buffer / Streams

async function downloadDocument(url, req, res) {
   let filename = req.params.idversiondocument;

   try {
       const result = await request.get(path.join(url, "/api/ged/" + req.params.idDocument + "/file"))
           .auth(req.token, {
               type: 'bearer'
           })
           .responseType('blob'); // get response as buffer (synchronous).

       res.status(result.status);
       res.write(result.body, 'binary'); // response = buffer as binary.
       return res.end();

   } catch (error) {
       logger.error(JSON.stringify(error));
       return res.status(error.status).send(error.message);
   }
};