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Convenient way found for letsencrypt with reverse proxy (apache, mod_alias, mod_proxy) #2164
I don't know what the latest standpoint is regarding ports for standalone, because there are so many issues googable regarding reverse proxies, I have absolutely no overview.
The idea was using the apache's Alias directive for e standardized challenge process for all variants of virtualhost configurations. With small tweaks it's also working with proxies.
Alias allows us to use this path globally over all virtualhosts.
As you can see, you can also choose another folder instead of /var/www/html - just use one you don't use anywhere else and adapt accordingly..