Http request client example (request client) in Node. js, node. jsrequest

Http request client example (request client) in Node. js, node. jsrequest

Node. JS has a request module that can easily capture webpage content. The simplest example is as follows:

var request = require('request');request('http://www.google.com', function (error, response, body) { if (!error && response.statusCode == 200) {  console.log(body); }})

From the above example, we can see that it is very simple to initiate an http request using a request. However, the only problem is that the third-party dependency of the request module is large, it takes several MB of space.

In fact, with the native http module of node. js, you can easily write a similar request function, just a few dozen lines:

var http = require('http')var url  = require('url')var request = function(reqUrl, data, cb, headers) { var dataType = typeof data if (dataType == 'function') {  headers = cb  cb   = data  rawData = null } else if (dataType == 'object') {  rawData = JSON.stringify(data) } else {  rawData = data } var urlObj = url.parse(reqUrl) var options = {   hostname : urlObj.hostname  , port   : urlObj.port  , path   : urlObj.pathname  , method  : rawData ? 'post' : 'get' } headers && (options.headers = headers) var req = http.request(options, function(res) {  var receives = []  if (res.statusCode !== 200) {   cb && cb(new Error('Request Failed. Status Code: ' + res.statusCode + ' ' + reqUrl))   return  }  res.on('data', function(chunk) {   receives.push(chunk)  })  res.on('end', function() {   var resData = Buffer.concat(receives).toString()   try {    resData = JSON.parse(resData)   } catch (e) { }   cb && cb(null, res, resData)  }) }) req.on('error', function(e) {  cb && cb(e) }) rawData && req.write(rawData) req.end()}module.exports = request

The interface is the same as the request module. For example, we capture the content of the Sina news homepage.

request('http://news.sina.com.cn', function(err, res, data) { console.log('geted', data)})

It also supports header authentication information, such

request('http://news.sina.com.cn', function(err, res, data) { console.log('get with cookie', data)}, { cookie: '_sessionid=1234567890' })

POST support

request('http://news.sina.com.cn', { postdata: 'json' }, function(err, res, data) { console.log('get with cookie', data)}, { cookie: '_sessionid=1234567890' })

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