npm install connect-image-optimus

Middleware to server image in optimal format. Switches from .jpg, .jpeg or .png to .webp or .jxr if possible. Works with Connect and Express.

Image-optimus analyzes Accept header of request and searches for image/webp. If search is successful, fs check for file with the same name but .webp extension is performed. In case of existance, url is changed so that other middleware (e.g. static) will serve webp format.
If there was no image/webp in Accept header, module performs a check on User-Agent header. These are browsers supporting webp format:

• Android Browser 4.0+
• Chrome 23.0+
• Opera 11.10+
• Google Chrome (desktop) 17+
• Google Chrome for Android version 25+

The same check is performed for serving jpeg-xr images if possible. These are browsers supporting this format:

• IE 9+

The last change made will be Vary header set to Accept so that caching proxies could distingiuish which content to load for the same requested url.

##Usage

Warning: image-optimus should be used before a middleware that is serving files so that it serves changed format file.

var optimus = require('connect-image-optimus');

var staticPath = __dirname + '/static/';

app.use(optimus(staticPath));
app.use(connect.static(staticPath));

##Contributing Feel free to open issues and send PRs, though make sure that you create tests for new functionality and amend ones for fixes and changes.

Run npm test in order to see test results.

The MIT License (MIT)

Copyright (c) 2014 Semenistyi Mykyta nikeiwe@gmail.com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.