为什么 Express/node.js 中的路由器返回 404

Question

我刚刚生成了 Express 应用并添加了自定义路由 (/configuration)。但是如果我尝试打开http://localhost:3000/configuration，服务器会返回 404 Not Found 错误。我检查了代码，不明白哪里出错了。

app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');

var index = require('./routes/index');
var config_page = require('./routes/configuration');

var app = express();

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/configuration', config_page);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// 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);
  res.render('error');
});

module.exports = app;

routes/configuration.js（routes/index.js 类似）

var express = require('express');
var router = express.Router();

/* GET configuration page. */
router.get('/configuration', function(req, res, next) {
  res.render('configuration', { title: 'My App | Configuration' });
});

module.exports = router;

Answer 1

这段代码有问题

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

您的应用程序生成的当前 URL 也是 http://localhost:3000/configuration/configuration。如果您对此进行查询，那么它将起作用。现在，如果您想将它与 http://localhost:3000/configuration 一起使用。那么你需要从任何地方删除路径。也许您可以像这样在主文件中进行更改

app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

app.use('/', index);
app.use('/',config_page); //-----------> this is the line you need to change

它如何用于错误处理。删除它并添加此代码以捕获应用程序中的任何错误。

process.on('uncaughtException', function (err) {
  // This should not happen
  logger.error("Pheew ....! Something unexpected happened. This should be handled more gracefully. I am sorry. The culprit is: ", err);
});