Usage and execution process of http module in node

const http = require('http')

const server = http.createServer()

server.on('request',function(){
    console.log('Received client request')
})

server.listen(3000,()=> {
    console.log("The server started successfully and can be accessed through http://127.0.0.1:3000/")
})

const http = require('http')

const server = http.createServer()
// The request event handler needs to receive two parameters // The request object // The request object can obtain some request information from the client, such as the request path // The response object // The response object can be used to send a response message to the client server.on('request', function(request, response) {
    console.log('Received the client's request', 'The request path is: '+request.url)
    // The response object has a method, write, which can be used to send response data to the client. // write can be used multiple times, but the last time you must use end to end the response, otherwise the client will keep waiting for response.write("hello")
    response.write("nodejs")
    response.end()
    //Tell the client that I have finished speaking and you can show it to the user //Since our server capabilities are very weak now, no matter what the request is, it can only respond with hello nodejs
    // How to request different paths and respond to different results})
server.listen(3000,()=> {
    console.log("The server started successfully and can be accessed through http://127.0.0.1:3000/")
})

const http = require("http")
const server = http.createServer()
server.on('request',function(req,res){
    res.writeHead(200,{'Content-Type':'text/plain;charset=utf-8'})
    console.log("Request received, request path is: "+req.url)
    // res.write("heel")
    // res.write("world")
    //res.end()
    // The above method is more troublesome // You can send a response when using end // Send different request results according to different request paths //1. Get the requested path // req.url gets the path after the port number // That is to say, all urls start with / //2. Determine the path and process the response const url = req.url
    if(url=="/"){
        const project = [
           {
            name:"Apple",
            price:"18",
           },
           {
            name:"Banana",
            price:"28",
           },
           {
            name:"Watermelon",
            price:"20",
           },
           {
            name:"xxx",
            price:"100",
           },
           {
            name:"aaa",
            price:"100",
           }
        ]
        // Response data can only be binary data or string // Response data cannot be: number object array Boolean value res.end(JSON.stringify(project))
    }else if(url=='/a'){
        const a = [
            {
             name:"Apple",
             price:"aa",
            },
            {
             name:"Banana",
             price:"ww",
            },
            {
             name:"Watermelon",
             price:"vv",
            },
            {
             name:"wjcx",
             price:"bb",
            },
            {
             name:"wdwa",
             price:"ww",
            }
         ]
         res.end(JSON.stringify(a))
    }
})
server.listen(3000,function(){
    console.log("Server started successfully, you can access it now! http://127.0.0.1:3000/")
})