title: Is it legal or safe to depend on the ordering of URL query parameters?
body: <p>Is it legal or safe to depend on the ordering of URL query parameters?  Specifically, would I be able to write code, and trust that that code will always work, that had different behavior based on these two query strings:</p>
  
  <pre><code>?a=10&amp;add=5&amp;multiply=3    # might mean (10 + 5) * 3
  ?a=10&amp;multiply=3&amp;add=5    # might mean (10 * 3) + 5
  </code></pre>
  
  <p>(My example is of course contrived, I know it's ridiculous to build a calculator like this. :) )</p>