节点服务器没有响应

Posted 2023-03-11

【中文标题】节点服务器没有响应

【英文标题】：Node Server is not Responding

【发布时间】：2021-02-07 02:28:18

【问题描述】：

我无法从 Localhost:3000 获得任何响应。我在该端口上运行节点，即使连接了数据库，它也成功连接，但节点没有给出任何响应。

这是我的代码..

包.json

  "name": "tax-engine",
  "version": "0.0.0",
  "scripts": 
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  ,
  "private": true,
  "dependencies": 
    "@angular/animations": "~10.1.0",
    "@angular/common": "~10.1.0",
    "@angular/compiler": "~10.1.0",
    "@angular/core": "~10.1.0",
    "@angular/forms": "~10.1.0",
    "@angular/material": "^10.2.4",
    "@angular/platform-browser": "~10.1.0",
    "@angular/platform-browser-dynamic": "~10.1.0",
    "@angular/router": "~10.1.0",
    "angular-material-fileupload": "^3.0.1",
    "express": "^4.17.1",
    "mongodb": "^3.6.2",
    "mongoose": "^5.10.9",
    "multer": "^1.4.2",
    "rxjs": "~6.6.0",
    "tslib": "^2.0.0",
    "zone.js": "~0.10.2"
  ,
  "devDependencies": 
    "@angular-devkit/build-angular": "~0.1001.0",
    "@angular/cli": "~10.1.0",
    "@angular/compiler-cli": "~10.1.0",
    "@types/node": "^12.11.1",
    "@types/jasmine": "~3.5.0",
    "@types/jasminewd2": "~2.0.3",
    "codelyzer": "^6.0.0",
    "jasmine-core": "~3.6.0",
    "jasmine-spec-reporter": "~5.0.0",
    "karma": "~5.0.0",
    "karma-chrome-launcher": "~3.1.0",
    "karma-coverage-istanbul-reporter": "~3.0.2",
    "karma-jasmine": "~4.0.0",
    "karma-jasmine-html-reporter": "^1.5.0",
    "protractor": "~7.0.0",
    "ts-node": "~8.3.0",
    "tslint": "~6.1.0",
    "typescript": "~4.0.2"
  

猫鼬.js

const  error  = require('console');
const  Module  = require('module');
const mongoose = require('mongoose');

mongoose.Promise = global.Promise;

mongoose.connect('mongodb://127.0.0.1:27017/test', useNewUrlParser: true, useUnifiedTopology: true )
  .then(() => console.log("Database Connected"))
  .catch((error) => console.log("error"));


module.exports = mongoose;

server.js

// const express = require('express');
// const app = express();
// const mongoose = require('./src/app/database/mongoose')

// /*CORS Cross Origin Request Security*/
// app.use((req, res, next) => 
//   res.header("Access-Control-Allow-Origin", "*");
//   res.header("Access-Control-Allow-Methods", "GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE");
//   res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
// );

// app.get('/', (req, res) => res.send('Hello World!'));

// app.use(express.json());
// app.listen(3000, () => console.log(`Example app listening on port 3000`));
// call all the required packages
const express = require('express')
const bodyParser= require('body-parser')
const multer = require('multer');
const mongoose = require('./src/app/database/mongoose')
//CREATE EXPRESS APP
const app = express();

const postmodel = require('./src/app/database/models/post')
app.use(express.json());

/*CORS Cross Origin Request Security*/
app.use((req, res, next) => 
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Methods", "GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
);

app.get('/getall', (req, res) => 
  post.find()
    .then(lists => res.send(lists))
    .catch((error) => console.log(error));
);



app.post("/Posts",(req, res, next)=>
  const post = new postmodel(
    title: req.body.title,
    content: req.body.content
  );
  post.save();
  console.log(post);
  res.status(201).json(
    message : 'Post Added Successfully'
  );
)

app.get("/getPosts", (req, res, next)=>
  postmodel.find()
    .then((documents)=>
    console.log(documents);
  );
  res.status(200).json(
    message: 'Posts Fetched Successfully',
    posts: posts
  );
);

//app.use(bodyParser.urlencoded(extended: true))


//ROUTES WILL GO HERE
app.get('/', function(req, res) 
    res.json( message: 'WELCOME' );
);

app.listen(3000, () => console.log('Server started on port 3000'));

通过 node server.js 后，输出如下.. 服务器在 3000 端口启动 已连接数据库

在浏览器的快照中.. Snapshot of localhost:3000 running on Chrome

这是邮递员的快照.. Snapshot from Postman

之前它正在运行，但最近几天它没有响应。

【问题讨论】：

@santimirandarp 是的 mongodb 正在运行.. 你要 tsconfig.json 文件吗？

你检查了 chrome devtools 看看你是否得到了 200 级的响应？

@santimirandarp 我去了 mongo 核心文件夹，从那里我进入命令提示符，然后我运行 mongod，然后运行 ​​mongo，它成功运行了.. 是的，它与 mongo 没有太大关系跨度>

@santimirandarp 尝试关闭 mongodb 但同样的问题仍然存在.. 没有任何路由响应。

可以分享一下服务器启动日志吗？您也可以使用 curl 尝试请求并共享其输出，您可以使用命令 curl -X GET "http://localhost:3000" 执行相同操作。

【参考方案1】：

试试这个

const express = require('express')
const bodyParser= require('body-parser')
const multer = require('multer');
const mongoose = require('./src/app/database/mongoose')
//CREATE EXPRESS APP
const app = express();

const postmodel = require('./src/app/database/models/post')
app.use(express.json());

/*CORS Cross Origin Request Security*/
app.use((req, res, next) => 
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Methods", "GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
next()
);

app.get('/getall', (req, res) => 
  post.find()
    .then(lists => res.send(lists))
    .catch((error) => console.log(error));
);



app.post("/Posts",(req, res, next)=>
  const post = new postmodel(
    title: req.body.title,
    content: req.body.content
  );
  post.save();
  console.log(post);
  res.status(201).json(
    message : 'Post Added Successfully'
  );
)

app.get("/getPosts", (req, res, next)=>
  postmodel.find()
    .then((documents)=>
    console.log(documents);
  );
  res.status(200).json(
    message: 'Posts Fetched Successfully',
    posts: posts
  );
);

//app.use(bodyParser.urlencoded(extended: true))


//ROUTES WILL GO HERE
app.get('/', function(req, res) 
    res.json( message: 'WELCOME' );
);

app.listen(3000, () => console.log('Server started on port 3000'));

这就是我改变的

app.use((req, res, next) => 
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Methods", "GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE");
  res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
next()
);

编辑

代码可以正常工作，但现在我相信它已修复。错过了一个next()。

【讨论】：

感谢您的回答。这件事奏效了。你能解释一下你做了什么吗？

能否请您删除与问题相同的代码并添加更改的部分？并请为您的答案添加解释。

@shaishavshah 代码挂在中间件 AFAIK 上。但是你也应该包括next()，就像我现在在代码中所做的那样。

@Minsky 明白了，谢谢你的帮助。