title: proxy: No protocol handler was valid for the URL /. If you are using a DSO version of mod_proxy
body: <p>I have added <code>ProxyPass</code> in the virtual-host and end up with below error in the error.log file.</p>
  
  <blockquote>
    <p>proxy: No protocol handler was valid for the URL /. If you are using a
    DSO version of mod_proxy, make sure the proxy submodules are included
    in the configuration using LoadModule.</p>
  </blockquote>
  
  <p>In the front end I get 500 when I request particular page.</p>
  
  <p>How can I fix this error?</p>