var fs = require('fs');
var zlib = require('zlib');
var gzip = zlib.createGzip();
var inFile = fs.createReadStream('./extra/fileForCompress.txt');
var out = fs.createWriteStream('./extra/fileForCompress.txt.gz');
inFile.pipe(gzip).pipe(out);

var fs = require('fs');
var zlib = require('zlib');
var gunzip = zlib.createGunzip();
var inFile = fs.createReadStream('./extra/fileForCompress.txt.gz');
var outFile = fs.createWriteStream('./extra/fileForCompress1.txt');
inFile.pipe(gunzip).pipe(outFile);

var http = require('http');
var zlib = require('zlib');
var fs = require('fs');
var filepath = './extra/fileForGzip.html';
var server = http.createServer(function(req, res){
  var acceptEncoding = req.headers['accept-encoding'];
  var gzip;
  if(acceptEncoding.indexOf('gzip')!=-1){ // 判断是否需要gzip压缩
    gzip = zlib.createGzip();
    // 记得响应 Content-Encoding，告诉浏览器：文件被 gzip 压缩过
    res.writeHead(200, {
      'Content-Encoding': 'gzip'
    });
    fs.createReadStream(filepath).pipe(gzip).pipe(res);
  }else{
    fs.createReadStream(filepath).pipe(res);
  }
});
server.listen('3000');

var http = require('http');
var zlib = require('zlib');
var responseText = 'hello world';
var server = http.createServer(function(req, res){
  var acceptEncoding = req.headers['accept-encoding'];
  if(acceptEncoding.indexOf('gzip')!=-1){
    res.writeHead(200, {
      'content-encoding': 'gzip'
    });
    res.end( zlib.gzipSync(responseText) );
  }else{
    res.end(responseText);
  }
});
server.listen('3000');