ionos: Cachify .htaccess for ssl enabled sites

.htaccess

# BEGIN CACHIFY
<IfModule mod_rewrite.c>
# ENGINE ON
RewriteEngine on
RewriteBase /

# set hostname directory
RewriteCond %{HTTPS} on
RewriteRule .* - [E=CACHIFY_HOST:https-%{HTTP_HOST}]
RewriteCond %{HTTPS} off
RewriteRule .* - [E=CACHIFY_HOST:%{HTTP_HOST}]

# set subdirectory
# sometimes %{REQUEST_URI} might be an empty string, so /$ won't match
RewriteCond %{REQUEST_URI} /$
RewriteRule .* - [E=CACHIFY_DIR:%{REQUEST_URI}]
RewriteCond %{REQUEST_URI} ^$
RewriteRule .* - [E=CACHIFY_DIR:/]

# gzip
RewriteRule .* - [E=CACHIFY_SUFFIX:]
<IfModule mod_mime.c>
	RewriteCond %{HTTP:Accept-Encoding} gzip
	RewriteRule .* - [E=CACHIFY_SUFFIX:.gz]
	AddType text/html .gz
	AddEncoding gzip .gz
</IfModule>

# Main Rules
RewriteCond %{THE_REQUEST} !^POST.*
RewriteCond %{QUERY_STRING} ^$
RewriteCond %{REQUEST_URI} !^/(wp-admin|wp-content/cache)/.*
RewriteCond %{HTTP_COOKIE} !(wp-postpass|wordpress_logged_in|comment_author)_
RewriteCond <DOCUMENT_ROOT>/wp-content/cache/cachify/%{ENV:CACHIFY_HOST}%{ENV:CACHIFY_DIR}index.html -f
RewriteRule ^(.*) /wp-content/cache/cachify/%{ENV:CACHIFY_HOST}%{ENV:CACHIFY_DIR}index.html%{ENV:CACHIFY_SUFFIX} [L]
</IfModule>
# END CACHIFY

1und1 does not populate the DOCUMENT_ROOT env var, so we have to enter it manually.

Thanks for this hint! This is still true for 1&1 IONOS.

All Apache mod_rewrite rules using %{DOCUMENT_ROOT} like the following from the Optimus plugin do not work:

# Optimus Start
<IfModule mod_rewrite.c>
        RewriteEngine On
        RewriteCond %{HTTP_ACCEPT} image/webp
        RewriteCond %{DOCUMENT_ROOT}/$1.webp -f
        RewriteRule ^(wp-content/uploads.+)\.(jpe?g|png)$ $1.webp [T=image/webp,E=accept:1]
</IfModule>
<IfModule mod_headers.c>
        Header append Vary Accept env=REDIRECT_accept
</IfModule>
AddType image/webp .webp
# Optimus Ende

Trying to set the environment variable with SetEnv as in the following does not work, because it is executed too late:

SetEnv DOCUMENT_ROOT /kunden/homepages/1/d123456789/htdocs/path/to/app

This is because rewrite rules are executed earlier. As documented in the Apache manual, SetEnvIf should be used instead; e.g., like this to unconditionally set the DOCUMENT_ROOT environment variable for all requests:

SetEnvIf Request_URI ".*" DOCUMENT_ROOT=/kunden/homepages/1/d123456789/htdocs/path/to/app

However, this did not work either on 1und1 IONOS in my testing.

The only solution that worked for me was to replace all instances of the %{DOCUMENT_ROOT} variable with the actual absolute filesystem path:

 # Optimus Start
 <IfModule mod_rewrite.c>
         RewriteEngine On
         RewriteCond %{HTTP_ACCEPT} image/webp
-        RewriteCond %{DOCUMENT_ROOT}/$1.webp -f
+        RewriteCond /kunden/homepages/1/d123456789/htdocs/path/to/app/$1.webp -f
         RewriteRule ^(wp-content/uploads.+)\.(jpe?g|png)$ $1.webp [T=image/webp,E=accept:1]
 </IfModule>
 <IfModule mod_headers.c>
         Header append Vary Accept env=REDIRECT_accept
 </IfModule>
 AddType image/webp .webp
 # Optimus Ende

You may use the pwd command to retrieve the full filesystem path or find it in the 1und1 IONOS hosting control center in the webspace settings of the domain.

If you only have one website/application in your account then your filesystem path will end with htdocs.

Update: Seems like some ionos managed servers dont seem to populate %{REQUEST_METHOD} either.

Changed RewriteCond %{REQUEST_METHOD} !=POST to RewriteCond %{THE_REQUEST} !^POST.*