title: UTM variables in rails
body: <p>I can get referer by <code>request.referer</code>, my question is how can i get <code>utm variables</code> of the referer?</p>
  
  <p>I have tried <code>params[:utm_source]</code> but it didn't work, <code>request.referer</code> gives me </p>
  
  <p><code>http://localhost:3001/show/?UTM_Source=newsletter&amp;UTM_Medium=email&amp;UTM_Campaign=unsubscribed</code></p>