Device Capabilities Detection Proxy
npm install devcapsIt's like Modernizr for the server-side. In actual
fact, the devcaps approach is simply a technique for invoking client-side
detection as required and passing that information to the server side.
 
The devcaps experiment was started for a couple of reasons:
1. Server-side customization of mobile web applications is
currently necessary
if you are going to build effective and efficient mobile web apps.
2. Current device detection techniques tend to use either
WURFL or naive User-Agent detection
to determine the device that is accessing the site.
3. We can do better. For clientside development we have progressed beyond the
dark ages of User-Agent Sniffing
to much more reliable (and useful)
Feature Detection
techniques. It's time that did something to bring these techniques to the server side.
The devcaps handshake process is similar in execution to the way authentication is
implemented in most web applications:
1. Check for a devcaps cookie.
2. If the devcaps cookie does not exist, then run the
detection routine.
This repository includes a reference implementation for NodeJS for the
devcaps implementation which _should_ be compatible with
connect middleware, although it has
been tested primarily with union.
The devcaps cookie format has been revised and is now even more compact. The
following is a good example of a valid devcaps cookie:
``
+2d+sk
The above cookie (which indicates that both canvas and websockets are supported)
is an example of Modernizr properties that have a
shortcode
associated with it. If a Modernizr capability is tested for that does not have a
corresponding shortcode, this will be included in the cookie in it's full form.
For example, +2d+sk+canvastext would be a valid cookie value if a test forModernizr.canvastext` had been requested and passed. Of course, if a short code
is eventually included canvastext then the shortcode would be used here instead.
Copyright (c) 2014 Damon Oehlman
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