nodejs下request模块中文gb2312乱码问题

使用nodejs的request包请求中文gb2312网页时会乱码，默认：

1 var request = require('request');
2 request(url, function(error, response, body) {
3     if (!error && response.statusCode == 200) {
4         console.log(body);
5     }
6 });

需要进行转码：

var request = require('request');
var Iconv = require('iconv-lite');
request({
    encoding: null,
    url: url
}, function(error, response, body) {
    if (!error && response.statusCode == 200) {
        console.log(Iconv.decode(body, 'gb2312').toString());
    }
});