[英]Express Route 404
我的node.js快速路由遇到问题。 我真的很新,看不到我的错误。 请求localhost:2700 / api / subs时总是出现404错误,但是我认为我的路线是正确的,不是吗? 有人看到错误了吗?
错误消息的开头:
Error: Not Found at ****/app.js:45:13 at Layer.handle [as handle_request] (****/node_modules/express/lib/router/layer.js:95:5)
这是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');
const mongoose = require('mongoose');
// establish connection to the Database
mongoose.connect('mongodb://localhost/test', {
useMongoClient: true
});
mongoose.connection.once('open', function() {
console.log('Connection to Database has been established..');
}).on('error', function(error){
console.log(error);
});
var index = require('./routes/index');
var users = require('./routes/users');
Subscriber = require('./routes/subscriber.js');
var app = express();
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');
// uncomment after placing your favicon in /public
//app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
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('/users', users);
// 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');
});
app.get('/api/subs', function(req, res){
Subscriber.getSubscribers(function(err, subscribers){
if(err){
throw err;
}
res.json(subscribers);
});
});
// ... here is a function which creates the database objects and saves
// them. took it out for better overview....
app.listen(2700, function(){
console.log("Listening on Port 2700")
});
module.exports = app;
和subscriber.js这是在子目录./routes:
const mongoose = require('mongoose');
var subscriberSchema = mongoose.Schema({
//seqnr shall go here. dunno how to declare integer x)
nr: Number,
name: String,
email: String,
uLink: String,
anwalt: String
});
var Subscriber = module.exports = mongoose.model('Subscriber', subscriberSchema);
//get Subscriber
module.exports.getSubscribers = function(callback, limit){
Subscriber.find(callback).limit(limit);
};
index.js
var express = require('express');
var router = express.Router();
/* GET home page. */
router.get('/', function(req, res, next) {
res.render('index', { title: 'Express' });
});
module.exports = router;
您需要将404 app.use
放在所有其他用途之后,否则它将忽略其后的api/subs
。
而且,此位将永远不会运行,因为它也位于api.use
,它将始终引发错误:
// 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');
});
另外,您实际上不应该为404抛出错误。 它应该告诉最终用户该页面不存在,但它不应使您的脚本崩溃。
我也同意另一个答案,即应该将这些代码块移至单独的路由器文件中,但这更多的是针对良好的实践和结构设计,而不是针对此特定的错误。
尝试将其放在单独的文件中,并在404处理程序之前将其包含在其他路由中
app.use('/', index);
app.use('/users', users);
所以...建立一个subs.js
路由
var express = require('express');
var router = express.Router();
Subscriber = require('./routes/subscriber.js');
router.get('/', function(req, res){
Subscriber.getSubscribers(function(err, subscribers){
if(err){
throw err;
}
res.json(subscribers);
});
});
module.exports = router;
然后将其包含在您的app.js
var subs= require('./routes/subs');
...
api.use('/api/subs', subs);
...
app.use(function(req, res, next) {
var err = new Error('Not Found');
err.status = 404;
next(err);
});
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