middleware/error-handler.js
/* eslint no-unused-vars: ["error", { "argsIgnorePattern": "next" }] */
module.exports = (err, request, response, next) => {
const status = err.status || 500;
response.status(status);
response.set('Content-Type', 'text/html');
response.send(`${err.message}\n${err.stack}`);
};