Question

我正在关注this tutorial自学如何通过节点连接到postgres。一切都运行良好，直到测试第一个请求，返回错误。

在浏览器中测试请求 - http://localhost:3000/api/puppies：

我已经准确地遵循了方向。可能出了什么问题？

404

Error: Not Found
    at /Users/alexander/node-postgres-promises/app.js:30:13
    at Layer.handle [as handle_request] (/Users/alexander/node-postgres-promises/node_modules/express/lib/router/layer.js:95:5)
    at trim_prefix (/Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:312:13)
    at /Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:280:7
    at Function.process_params (/Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:330:12)
    at next (/Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:271:10)
    at /Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:618:15
    at next (/Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:256:14)
    at Function.handle (/Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:176:3)
    at router (/Users/alexander/node-postgres-promises/node_modules/express/lib/router/index.js:46:12)

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 routes = require('./routes/index');
var users = require('./routes/users');

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('/', routes);
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 handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});


module.exports = app;

路由/ 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;

Answer 1

它正在做正确的事。您正试图获取http://localhost:3000/api/puppies并且没有相关的路线，但您确实拥有一个全能的处理程序

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

捕获所有其他内容并使用文本＆＃34; Not Found＆＃34;抛出错误。

使用Node和Postgres设计RESTful API出错

1 个答案: