node.js - 全局异常处理程序无法在node.js中工作

Question

如果发生异常，由于未调用错误处理程序，因此请求没有结束。控制台显示错误，但我的消息“内部服务器错误”未发送为
响应。错误块未进入全局处理程序内。

const createError = require('http-errors');
const express = require('express');
const path = require('path');
const cors = require('cors');
const cookieParser = require('cookie-parser');
const logger = require('morgan');
const bodyParser = require('body-parser');
const rulesRouter = require('./routes/rules');
const lambdasRouter = require('./routes/lambda');

const app = express();
app.use(cors());
app.use(bodyParser.urlencoded({extended: true}));
app.use(bodyParser.json());
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(logger('dev'));
app.use(cookieParser());
app.use(express['static'](path.join(__dirname, 'public')));


app.use('/api', rulesRouter);
app.use('/lambda', lambdasRouter);

app.use(function(req, res, next) {
  res.status(404).send({
    'api_error': {
      'dev_msg': 'Resource not available : Not Found',
      'user_msg': 'Resource not available',
      'user_msg_title': 'Not found!',
      'code': 404,
    },
  });
});

//error handler
app.use(function(err, req, res, next) {
  // set locals, only providing error in development
  res.locals.message = err.message;
  res.locals.error = req.app.get('env') === 'development' ? err : {};

  // render the error page
  res.status(err.status || 500).send('interal server error');
});



module.exports = app;

Answer 1

您能告诉我们如何发送错误吗？
我们通常会

try {

    throw new Error('New error');

} catch(error) {
    next(error)
}

这是将错误发送到下一个错误处理中间件的next(error)