gzip-wrapper.js

var compress = require('./lib/compress');
var sys  = require('sys');

exports.gzip = function(request, response, result) {
    var encoding = 'gzip';
    if ((request.headers['accept-encoding'] || '').indexOf(encoding) >= 0) {
        var contentType = result.headers["Content-Type"];
        contentType = contentType && contentType.split("/")[0];
        if (!result.headers['Content-Encoding'] && // skip if already encoded
                result.status != 204 && // of if no body
                (contentType == "application" || contentType == "text")) { // or if not an acceptable type

            var zipper = new compress.Gzip;
            zipper.init();
            var zip = zipper.deflate(result.body, 'utf-8') + zipper.end();

            result.headers['Content-Encoding'] = encoding;
            result.headers['Content-Length'] = zip.length;

            response.writeHead(result.status, result.headers);
            response.write(zip, 'binary');
            response.end();
            return;
        }
    }
    sys.log('No gzip, client: ' + request.headers['user-agent'] + '. Sending raw ' + result.headers['Content-Type']); 
    response.writeHead(result.status, result.headers);
    response.end(result.body);
};