etagify

NodeJS connect middleware. Adding ETag headers to cachable but non-static content since 2012.

before

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

app.get(function(req, res) {
  res.send("pulitzer prize. bam.");
});

... and on the other side of the TCP connection ...

HTTP/1.0 200 Fresh Hot Content
Content-Length: 20

after

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

app.use(require('etagify')());

app.get('/page', function(req, res) {
  res.etagify();
  res.send("pulitzer prize. bam.");
});

... and on the other side of the TCP connection ...

HTTP/1.0 304 Winning
Content-Length: 0

words

ETag headers are a client caching mechanism that when applied let you push fewer bits over the wire and make web pages load faster. Pages you serve through connect's static middleware already have proper ETag headers. All other dynamic request - like templates rendered on the server - don't. If you serve non-static content that is gauranteed not to change between server restarts in production, the etagify middleware makes it easy to serve this content with proper etag headers based on a hash of your content.

see also...

...cachify for a way to get awesome long term caching of your static resources.

license

Copyright (c) 2012, Lloyd Hilaiel <lloyd@hilaiel.com>

Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.

THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.