title: Encoding key-value pairs in an RSS feed's URL
body: <p>I've noticed that most websites don't set up their RSS feed URLs to make use of encoded key-value pairs that let one create specific queries, like the following fictional example:</p>
  
  <pre><code>http://stackoverflow.com/feeds?tag=python&amp;lang=en&amp;minvotes=2
  </code></pre>
  
  <p>Is there a particular technical reason for this? Or am I just not finding the RSS feeds that do this?</p>