Offload HTTPS traffic to Nginx only / Enginitron Cpanel

Publish date: 2020-06-21

Hello, Guide which is posted on is outdated and breaks Force SSL Functionality in Cpanel. So Here is my Solution:

Step 1. Edit /etc/apache2/conf.d/includes/pre_virtualhost_global.conf and append:

SetEnvIf X-Forwarded-Proto "https" HTTPS=on

Step 2. Run

cp /var/cpanel/templates/apache2_4/vhost.default /var/cpanel/templates/apache2_4/vhost.local
sed -i 's/RewriteCond %{HTTPS} !=on/RewriteCond %{HTTP:X-Forwarded-Proto} !https/g' /var/cpanel/templates/apache2_4/vhost.local

Step 3. Edit /etc/nginx/proxy_params_common to update proxy_pass:

proxy_pass http://$PROXY_DOMAIN_OR_IP:8080;

Step 4. restart both apache & nginx

apachectl restart systemctl restart nginx

So what are we actually doing here?

The question is, does it work? Yes, it does!

Any caveats? Glad you asked. The only I have come across is with sites using a force-rewrite to https in their .htaccess file. Typically, the code used would be:

RewriteEngine On
RewriteCond %{HTTPS} off
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

However, since Apache has SSL offloaded and therefore it is not handing HTTPS itself, and this activity is happening directly inside Apache (not PHP, Python, Ruby etc who are already informed about HTTPS), this code will produce a redirect loop. The solution is to use the following .htaccess code instead:

RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteRule .* https://%{SERVER_NAME}%{REQUEST_URI} [R=301,L]

One more thing! This is slightly unrelated, but sysadmins do note… when using Engintron’s Nginx in front of Apache, we should remove mod_deflate from EasyApache 4. Otherwise, we will waste CPU cycles by GZIPing content twice on the web server (once on Apache, once on nginx) for no reason. This will give a very slight performance boost.

p.s: you can use grep to find sites using htaccess redirect to avoid redirect loops: grep -rnHIi '{HTTPS}' --include=.htaccess /home

Author of original guide is : @cloudunboxed-olorinhenderson

Author of Revised version : Vasil Jamalashvili