Monit can be used from behind a proxy server.

Here is an example on how to configure Nginx proxy in front of Monit. In this example Monit listens on http://192.168.1.10:2812 and we configure Nginx so Monit is accessible via this Nginx proxy URL, http://nginx.addr.ess/monit/

    location /monit/ {
        rewrite ^/monit/(.*) /$1 break;
        proxy_ignore_client_abort on;
        proxy_pass   http://192.168.1.10:2812; 
        proxy_redirect  http://192.168.1.10:2812 /monit; 
        proxy_cookie_path / /monit/;
    }

If the proxy redirect does not redirect correctly to e.g. https://nginx.addr.ess/monit/* when you click on an action button in Monit, like [start, stop, unmonitor], try to add the full destination URL to proxy_redirect instead, like so:

    proxy_redirect http://192.168.1.10:2812 https://nginx.addr.ess/monit; 

Note that we here also redirect from http (Monit) to https (Nginx)