How to not gzip certain files ?

[pinouchon]

I have an issue where gzippo overrides the http headers, and it causes my html files to never refresh.

For example:

express.js:

var express = require('express');
var app = express();

app.configure(function () {
  app.use(function (req, res, next) {
    res.setHeader('foo', 'bar');
    return next();
  });
});

var connect = require('connect');
connect.createServer(
  connect.static("" + __dirname + "/dist")
).listen(8090);

gzippo.js

var gzippo = require('gzippo');
var express = require('express');
var app = express();

app.configure(function () {
  app.use(function (req, res, next) {
    //res.set('Cache-Control', 'public, max-age=0');
    //res.set('X-Powered-By', 'Express');
    res.set('X-Powered-By', '')
    res.set('Accept-Ranges', 'bytes');
    res.set('ETag', '"50-1393582560000"');
    res.set('Date', 'Fri, 28 Feb 2014 10:35:50 GMT');
    res.set('Cache-Control', 'public, max-age=0');
    res.set('Last-Modified', 'Fri, 28 Feb 2014 10:16:00 GMT');
    res.set('Content-Type', 'text/html; charset=UTF-8');
    res.set('Content-Length', '50');
    res.set('Connection', 'keep-alive');
    return next();
  });
});

//var logFile = fs.createWriteStream('./myLogFile.log', {flags: 'w'}); //use {flags: 'w'} to open in write mode
//app.use(express.logger({stream: logFile}));

app.use(express.logger('dev'));
//app.use(gzippo.staticGzip("" + __dirname + "/dist", {maxAge: 0, clientMaxAge: 0}), {maxAge: 0, clientMaxAge: 0});
app.use(gzippo.staticGzip("" + __dirname + "/dist", {maxAge: 0, clientMaxAge: 0}), {maxAge: 0, clientMaxAge: 0});

app.listen(8090);

• Launch node express.js. Get an html file and inspect headers. (in chrome, and with curl -I)
• Launch node gzippo.js. Get an html file and inspect headers. (in chrome, and with curl -I)

You will see that chrome will override max-age: 0 for the gzippo server. Why is that ?

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In my case, it would be great to specify to my gzippo server not to gzipo html files.