server.js

fs = require("fs");
http = require("http");
url = require("url");
Jimp = require("jimp");

http.createServer(function (req, res) {
  var request = url.parse(req.url, true);
  var action = request.pathname;

  if(action == "/image.bmp") {
    // なぜかタイムアウトして画像が設定できないんですけど！！！
    var img = fs.readFileSync('./image.bmp', {encoding: null});
    var buffer = new Buffer.from(img);
    console.log(buffer);
    res.statusMessage = "OK";
    res.writeHead(200, {'Content-Type': 'image/bmp' });
    res.end(img);
  } else {
    res.statusMessage = "OK";
    res.writeHead(200, { 'Content-Type': 'application/json' });
    res.end('{"template":"template1","title":"@takeda_san","subtitle":"Programer","bodytext":"nanimo shitenai noni Code Card ga kawatta","icon":"duke","backgroundColor":"white"}');
  }
}).listen(80);