Dismembered HTTP Server Build

Better read please poke here 1. The simplest HTTP server

// server.jsvar http = require("http");http.createServer(function(request, response) {  response.writeHead(200, {"Content-Type": "text/plain"});  response.write("Hello World");  response.end();}).listen(8888);//  node server.js// 打开http://localhost:8888/，你会看到一个写着“Hello World”的网页~

It's so simple, this article is finished ~

Oh,no
Too young, too

2. Dismemberment Code

• var http = require("http")
  • Request (require) node. js's own HTTP module and assign it to an HTTP variable
• createServer
  • Listen Method-Numeric parameter specifies the port number that the HTTP server listens on
• createServerThe parameters
  • Event-driven callbacks
    • Whenever our server receives a request, the function is called

• Request Processing

  When the ONrequest () function is triggered, there are two parameter objects
  • Request

  • Response

    // 发送一个HTTP状态200和HTTP头的内容类型response.writeHead(200, {"Content-Type": "text/plain"});// 添加HTTP主体内容response.write("Hello World");// 完成响应response.end();

3. Module encapsulation

This step we turn server.js into a real node. JS Module

1. function encapsulation
   Wrap our script inside a function and export the encapsulation function

   var http = require("http");function start() {  function onRequest(request, response) {    console.log("Request received.");    response.writeHead(200, {"Content-Type": "text/plain"});    response.write("Hello World");    response.end();  }  http.createServer(onRequest).listen(8888);  console.log("Server has started.");}exports.start = start;

2. Module reference

   // 如主文件名为index.js，写入var server = require("./server");server.start();

   Performnode index.js

4. Routing

All request data is in the requests object, data parsing, URL required, QueryString module

Come on, let's try to find the browser request path ~

4.1 Getting the route

var http = require("http");var url = require('url')function start(){  function onRequest(req, res){    var url = url.parse(req.url)    // 打印 url 信息    console.log('server start url', url)    res.writeHead(200, {"content-type": "text/plain"})    res.end()  }  http.createServer(onRequest).listen(8888)}exports.start = start

Request.url parameter printing:

4.2 There is a way to find

Introducing routing Processing

• Create Route.js, process routing information, introduce the module on the index page, and execute as a parameter to the start function in the server.
• Parse each request and get its URL path for processing

// server.jsvar http = require("http");var url = require('url')function start(route){  function onRequest(req, res){    var pathname = url.parse(req.url).pathname    route(pathname)    res.writeHead(200, {"content-type": "text/plain"})    res.end()  }  http.createServer(onRequest).listen(8888)}exports.start = start

// route.jsfunction route(pathname){  console.log('route', pathname)}exports.route = route// index.js  引入routevar server = require('./server')var router = require('./route')server.start(router.route)

The above code we have achieved a way to find

To avoid multiple if. else: We pass a series of requests through objects

• First create a Requestmanager module, export multiple processing functions
• Creating a Managers object: mapping different routes to the processing method
• Pass the mapping of a route to a function as a parameter to the server
• The processing result of calling route in

• Server

   //requestmanager.jsfunction start () {Console.log (' Route-----start ') return ' hello start '}function next () {Console.log (' route-----Next ') return ' Hello Next '}exports.star t = Startexports.next = next  

   //Index.jsvar server = require ('./readfile ') var router = Require ('./route ') var requestmanager = require ('./requestmanager ') var managers = []managers['/'] = requestmanager.startmanagers['/start ' = requestmanager.startmanagers['/next '] = RequestManager.nextserver.start ( Router.route, managers)//Http://localhost:8888/start, the browser will output "Hello start"//Http://localhost:8888/next will output "Hello Next "//Http://localhost:8888/chaoran will output" 404 ". 

• Manager: Each route provides a corresponding handler function

  // server.jsvar http = require("http");var url = require('url')function start(route, manager){  function onRequest(req, res){    var pathname = url.parse(req.url).pathname    console.log('server request for', pathname)    var content = route(pathname, manager)    res.writeHead(200, {"content-type": "text/plain"})    res.write(content)    res.end()  }  http.createServer(onRequest).listen(8888)}exports.start = start

• Remove the routed event from the managers for processing

  // route.jsfunction route(pathname, managers){  console.log('rrr', pathname)  if(typeof managers[pathname] == 'function'){    return managers[pathname]()  }else {    console.log('managers no found')    return ''  }}exports.route = route

Well, it can be used, it is occasionally hung (") ~→

As for the parallel in node and how to implement non-blocking, next time we combine examples to learn ~

Reference:

• Node Getting Started

• In layman Nodejs

Dismembered HTTP Server Build