Apache: mod_rewrite does not respect env HTTPS

Question

I have Apache SSL virtuals behind the Nginx proxy defined with this directive:

SetEnvIf X-Forwarded-Proto https HTTPS=on

Users often use the following rewrite rule in their htaccess files for detecting SSL connection, but the variable HTTPS is not treated as expected:

RewriteCond %{HTTPS} =on

Is there any workaround for this? So far, I tried to disable mod_ssl completely and also checked modules hooks and it seems that environment files are loaded before the rewrite module.

Answer 1

%{HTTPS} does not look up an environment variable. It calls a function that asks the mod_ssl if if the connection is using SSL.

If it's not used for security, and your users know what it means, you could have them use %{ENV:HTTPS}