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This article is about the usefulness of the http module in Node.js. The editor thinks it is very practical, so share it with you as a reference and follow the editor to have a look.

Http module

As a virtual platform for information transmission, reception and sharing, the network connects the information of various points, faces and bodies together, so as to realize the sharing of these resources. There are certain rules for network data transmission, which are called protocols. Http protocol is one of the rules, and it is one of the most frequently used network transmission protocols.

1. What is the HTTP protocol?

Hypertext transfer Protocol (Hyper Text Transfer Protocol,HTTP) is a simple request-response protocol that usually runs on top of TCP. It specifies what kind of message the client might send to the server and what kind of response it gets. The headers of the request and response messages are given in ASCII form; the message content has a MIME-like format. The HTTP protocol defines the data format and process of data transfer between the browser and the server over the network.

2. Details of HTTP protocol constraints

The HTTTP protocol defines the format and process of data exchange between the browser and the server. The details are as follows:

Defines the format in which the browser sends requests to the server

Defines the format in which the server parses the data sent by the browser

Defines the format in which the server responds to the data to the browser

Defines the format in which the browser parses the data of the server response

3. HTTP request response process

Take a visit to a web page as an example, the request response process is as follows:

4. Http module get method

Because most of the requests in the network are in get mode and without the request body, the http module of Node.js provides a convenient method. As follows:

Var http=require ('http'); var fs = require (' fs'); http.get ('http://www.itsource.cn',function(res){ / / res is an IncomingMessage object / / console.log (res); var stream = fs.createWriteStream ('. / a.html'); / / res is a stream object and can listen for data event res.on ('data',function (data) {console.log (data.toString () Stream.write (data);}); res.on ('end',function () {stream.end (); console.log (' download successful');}); / / or use pipeline / / res.pipe (stream);})

The above example uses the get method to get the contents of the file and save the contents to the file. The example results are as follows:

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