Attempt to do conditional gzip decoding based on the Content-Encoding response header with the mikeal/request library for Node.js. This does not work.

gistfile1.js

var request = require('request'),
  zlib = require('zlib');

var headers = {
  "accept-charset" : "ISO-8859-1,utf-8;q=0.7,*;q=0.3",
  "accept-language" : "en-US,en;q=0.8",
  "accept" : "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
  "user-agent" : "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/537.13+ (KHTML, like Gecko) Version/5.1.7 Safari/534.57.2",
  "accept-encoding" : "gzip,deflate",
};

var options = {
  url: "http://google.com",
  headers: headers
};

var req = request(options, function (err, res, body) {
  var body = '';

  res.on('error', function(err) {
    console.log(err);
  });

  var output;
  if (res.headers['content-encoding'] == 'gzip') {
    var gzip = zlib.createGunzip();
    res.pipe(gzip);
    output = gzip;
  } else {
    output = res;
  }

  output.on('data', function (data) {
     data = data.toString('utf-8');
     body += data;
  });

  output.on('end', function() {
    console.log(body);
  });

});

req.on('error', function(err) {
   console.log(err);
});