节点 Api 不响应邮递员或通过浏览器（无状态代码）但在终端上它没有显示错误

Question

我正在为员工部门模型开发一个节点API

为此我开发了几个类似 'GET PUSH PATCH DELETE' 的请求（CRUD 操作）对于最终员工和部门

我正在本地服务器上开发这是我的 app.js 看起来像

const http=require('http');
const app =require('./app');

const port =process.env.PORT || 3000;

const server = http.createServer(app);

server.listen(port);

console.log('Server Has Been Started');
console.log('localhost:'+port);

而在听众方面，这是我的 app.js 看起来像

// Dependency 

const express = require('express');
const app = express();
const morgan =require('morgan');
const bodyParser =require('body-parser');
const mongoose =require('mongoose');


// Importing routes 

const employeeRoutes =require('./api/routes/employee');
const departmentRoutes =require('./api/routes/department');



app.use(morgan('dev'));
app.use(bodyParser.urlencoded({extended:true}));
app.use(bodyParser.json());

// Header Defination to Avoid Corp's

app.use((req, res ,next) =>
{
    res.header("Access-Control-Allow-Origin","*");
    res.header(
        "Access-Control-Allow-Headers",
        "Origin,X-Requested-With,Content-Type,Accept,Authorization"
        );
    if (req.method === 'OPTIONS')
    {
        res.header('Access-Control-Allow-Methods','PUT,POST,PATCH,DELETE,GET');
        return res.status(200).json({});
    }




});

// Routes for api 
app.use('/employee',employeeRoutes);
app.use('/department',departmentRoutes);


// Error Handling 

app.use((req, res, next) =>
{ 
    const error =new Error('Not Found');
    error.status =404;
    next(error);

});

app.use((error, req, res, next) =>
{ 
    
    res.status(error.status ||500);
    res.json({
        error:{
            message:error.message
        }
    });

});




module.exports = app;

为了在另一端作为 json 发送请求和接收响应我用 GET PUSH PATCH DELETE 开发了 employee .js 和 department .js 这是我的两个文件看起来像

./api/routes/employee.js

它只是展示验证代码是否正常工作的脚本

const express = require('express');
const router =express.Router();
const mongoose =require('mongoose');
const Employee =require('../models/Employee');

router.get('/',(req, res ,next) => {
    res.status(200).json({
        message:'Handling GET request to ./employees'
    });
});


router.post('/',(req, res ,next) => {
    res.status(201).json({
        message:'Handling POST request to ./employees',
       
    });
});

router.get('/:employeeId',(req, res ,next) =>
{
    const id =req.params.employeeId;
    if (id === 'special'){
        res.status(200).json({
            message: 'You Discovered A speacial ID',
            id:id
        });
    } else
    {
        res.status(200).json({
            message:'You passed an ID'
        });
    }
});

router.patch('/:employeeId',(req, res ,next) =>
{
    res.status(200).json({
        message:'Updated Employees'

    });
});


router.delete('/:employeeId',(req, res ,next) =>
{
    res.status(200).json({
        message:'Deleted  Employee'

    });
});



module.exports =router;

../api/routes/department.js

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

router.get('/',(req, res ,next) =>{
    res.status(200).json({
        message:'Department fetched'
    });
});

router.post('/',(req, res ,next) =>{
    const department={
        name:req.body.name,
        Id:req.body.Id
    };
    res.status(201).json({
        message:'Department created',
        createdDepartment:department
    });
});

router.get('/:departmentId',(req, res ,next) =>{
    res.status(200).json({
        message:'Department Details',
        departmentId: req.params.departmentId
    });
});

router.delete('/:departmentId',(req, res ,next) =>{
    res.status(200).json({
        message:'Department Deleted',
        departmentId: req.params.departmentId
    });
});

router.patch('/:departmentId',(req, res ,next) =>
{
    res.status(200).json({
        message:'Department Updated',
        departmentId :req.params.departmentId

    });
});



module.exports =router;

现在，当我尝试运行这段代码作为我的编码经验时，它没有逻辑错误它也在终端上显示 terminal o/p

但是当我尝试在邮递员中运行它只是加载没有响应回来喜欢postman o/p

还有网络上的 web o/p

然后进入终端就像 terminal after get not respond still server is running

我知道连接有问题，但我仔细检查了所有可能的方式，比如禁用代理和防火墙

我还尝试删除节点模块和 package.json（锁定）并重新安装它们，但它们都不起作用当我停止服务器邮递员显示套接字挂断 sockethangup postman 我想知道我哪里缺少有意义的答案

Answer 1

添加 next() 将请求传递给 CORS 部分之后的下一个中间件。

// Header Defination to Avoid Corp's

app.use((req, res ,next) =>
{
    res.header("Access-Control-Allow-Origin","*");
    res.header(
        "Access-Control-Allow-Headers",
        "Origin,X-Requested-With,Content-Type,Accept,Authorization"
        );
    if (req.method === 'OPTIONS')
    {
        res.header('Access-Control-Allow-Methods','PUT,POST,PATCH,DELETE,GET');
        return res.status(200).json({});
    }

  // Pass next middleware
  next();

});

节点 Api 不响应邮递员或通过浏览器（无状态代码）但在终端上它没有显示错误

Node Api Doesn't Respond To Postman or through Browser (No Status Code) But on Terminal It showed no error

javascript

node.js

express

postman

body-parser