Nodejs关于gzip/deflate压缩详解

    }),
};
var options = {
    hostname: ‘homeway.me’,
    port: 80,
    path: ‘/’,
    method: ‘GET’,
    headers: {
        ‘Accept’:’text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8′,
        ‘Content-Length’: args.contents.length,
        ‘User-Agent’:’Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.11 Safari/537.36′,
        ‘Accept-Encoding’:’gzip, deflate’,
   },
};
var get = function ( options, args, callback ){
    var req = http.request(options, function (res) {
        var chunks =[], data, encoding = res.headers[‘content-encoding’];
        // 非gzip/deflate要转成utf-8格式
        if( encoding === ‘undefined’){
            res.setEncoding(‘utf-8’);
        }
        res.on(‘data’, function (chunk){
            chunks.push(chunk);
        });
        res.on(‘end’, function (){
            var buffer = Buffer.concat(chunks);
            if (encoding == ‘gzip’) {
                zlib.gunzip(buffer, function (err, decoded) {
                    data = decoded.toString();
                    callback( err, args, res.headers, data);
                });
            } else if (encoding == ‘deflate’) {
                zlib.inflate(buffer, function (err, decoded) {
                    data = decoded.toString();
                    callback( err, args, res.headers, data);