How to make a correct redirect in mod_proxy apache2?

Question

Apache HTTP Server

Good day to all!
I have an Apache2 server that uses mod_rewrite for redirects in an .htaccess file located in the /var/www/html directory,

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} ^/$ [NC]
RewriteRule ^ humhub/index.php [NC,L]

but I want to implement this using mod_proxy, which is located separately, it would seem, what is the difficulty? and the fact that the redirect works very strangely, I give the virtual host file for review:

<VirtualHost *:80>
        ServerAdmin [email protected]
        DocumentRoot "/var/www/html"
        ServerName      corp.test.ru
        ServerAlias     corp.test.ru www.corp.test.ru
        ProxyRequests Off
        ProxyPreserveHost On
        ProxyVia full
        <Proxy *>
        Order deny,allow
        Allow from all
        </Proxy>
        ProxyPass /  http://192.168.6.93:14799/humhub/
        ProxyPassReverse /  http://192.168.6.93:14799/humhub/
</VirtualHost>

When accessing the mod_proxy site, the url changes, as in the case of mod_rewrite, but the server reports an error.

An example of how it works with mod_rewrite and as you can see the site opens

Please, tell me, what could be the problem? What am I doing wrong?
Thank you all in advance!