title: Do I need to escape forward slashes in a URL query string?
body: <p>For example, is this valid and expresses <code>key = &quot;ab/cd&quot;</code>:</p>
  <pre><code>http://example.com?key=ab/cd
  </code></pre>
  <p>or do I have to percent <code>%</code> encode the <code>/</code> as in:</p>
  <pre><code>http://example.com?key=ab%2Fcd
  </code></pre>