title: How fix "The requested URL was rejected" on backend octobercms
body: <p>I'm using octobercms in my hosting, and my website (theme) is working normally, the problem is being in the backend. I can access the backend correctly, however, when I try to register, update or delete any record I have the following return:</p>
  
  <p><code>The requested URL was rejected. If you think this is an error, please contact the webmaster. Your support ID is:</code></p>
  
  <p>I've already made several attempts to fix this problem, like clearing the browser cookies, I tried updating the octobercms, but nothing worked.</p>