title: Browser Feature Detection with NGINX
body: <p>Does anyone know of a plugin for NGINX that allows for the server to provide a specific file based on the features of the browser? For example:</p>
  
  <pre><code>if(Browser.Features.CSS3) {
    url.rewrite .../super_combined_css.css
  }
  else {
    url.rewrite .../basic_combined_css.css
  }
  </code></pre>
  
  <p>I'm assuming it would just have a predefined list of browsers that exists that fall into certain categories (say CSS3 support, CSS animations, SVG support, etc...). Once a request comes in then it just analyzes the user-agent string to figure out what category the browser falls into.</p>
  
  <p>Any ideas?</p>