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This article focuses on "how to use Node.js to build a HTTP server", interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let's let the editor take you to learn how to use Node.js to build a HTTP server.

What is a HTTP service?

What is the HTTP protocol?

Hypertext transfer protocol, an application layer protocol, a convention and specification for transferring hypertext data such as text, pictures, audio, video and so on between two points in the computer world.

A web page request that contains two HTTP packet exchanges:

The browser sends a request HTTP packet to the HTTP server

The HTTP server returns the HTTP package to the browser

What does the HTTP service do?

Parsed HTTP request message

Return the corresponding HTTP return message

Implement a simple HTTP server

Create a new http.js file and write the following code:

/ / http is the package that comes with Node. Load here and introduce const http = require ('http') / / create a Web static server through http.createServer. Http.createServer (function (request, response) {/ / request object contains all the contents of the user request message / / We can use the request object to listen for the request. Get the data / / response response object submitted by the user to respond to some data / / when the server wants to respond to the data to the client, it must use the response object response.writeHead Response.end ('hello world');}) .server (4000, function () {/ / enable the service console.log through the listen listening port ("the server has been started, available at the following address: http://localhost:4000");})"

Terminal operation command: node http.js

You can see that the service has been started, and open http://localhost:4000 in Chrome:

The contents of response.end () are already displayed on the page, and such a simple HTTP server is implemented.

Fs module loads static resources

Create a new index.js file:

/ / load module const http = require ('http') const fs = require (' fs'); / / create service http.createServer (function (request, response) {console.log (request.url); response.writeHead (200); response.end ();}) .subscription (3000)

Terminal runs: node index.js, browser opens localhost:3000

Here, two requests are sent, one for the current url http://localhost:3000/, and the other for the icon http://localhost:3000/favicon.ico in the upper right corner:

Then do some processing for the request of / favicon.ico, return the status code directly, and then deal with the static resources through the fs module:

/ / load module const http = require ('http') const fs = require (' fs'); / / create service http.createServer (function (request, response) {/ / console.log (request.url); / / if it is an icon request, return 200 if (request.url ='/ favicon.ico') {response.writeHead (200); response.end () return} response.writeHead (200) / / fs is a file module, and local files can be read through createReadStream. Here, the index.html file in the directory is read / / the response object fs.createReadStream (_ _ dirname +'/ index.html') .pipe (response)} is written through pipe. Pipe (3000)

The index.html file is as follows:

Implement a simple HTTP server hello HTTP service

Terminal operation: node index.js startup service:

As you can see, the HTTP server has given the computer's static resource index.html to the browser.

Such a simple HTTP server that reads computer static resources is implemented!

Node.js 's two built-in modules http and fs are used in this HTTP server, and there are many modules in Node.js that can help us achieve powerful functions, which make the Node.js ecology more powerful.

At this point, I believe you have a deeper understanding of "how to use Node.js to build a HTTP server". You might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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