I am trying to set up Apache as a reverse proxy (https://proxysite.com) for a ADFS SAML enabled site (https://originalsite.com). I am receiving 404 if I enable ProxyPreserveHost On. If I disable the same, it is successfully authenticating but re-directing to original host which I don't want to redirect.

Below is my configuration.

<VirtualHost *:80>

    ServerName proxysite.com

    ProxyPreserveHost On
    ProxyPass / https://originalsite.com
    ProxyPassReverse / https://originalsite.com

</VirtualHost>