title: Replace html encoding with url encoding
body: <p>We are getting random hits like:</p>
  
  <p><code>/abc?p=2&amp;amp;utm_campaign=xyz-campaign&amp;amp;utm_medium=email&amp;amp;utm_source=newsletter</code></p>
  
  <p>Notice <code>&amp;amp;</code> which is html encoding for &amp;. I have checked the possible sources but they all contain '&amp;' only. 
  I want replace all <code>&amp;amp;</code> with &amp;. Is there a way to achieve it? I have removed complete string as of now using below given rule. But this is not right!</p>
  
  <pre><code>    RewriteCond %{QUERY_STRING} (&amp;amp;)
      RewriteRule (.*?) https://%{HTTP_HOST}%{REQUEST_URI}? [R=302,L]
  </code></pre>