Apache: redirect homepage based on accept-language

apache/website.conf

@@ -5,9 +5,11 @@
         DocumentRoot /var/www/404
 
         RewriteEngine On
+        RewriteCond %{HTTP:Accept-Language} ^de [NC]
+        RewriteRule ^/$ https://berlin.freifunk.net/de/ [R=302,L]
         RewriteCond %{REQUEST_URI} !^/.well-known/
-        RewriteRule ^/$ https://berlin.freifunk.net/de/ [R=301,L]
-        RewriteRule ^/index_en https://berlin.freifunk.net/en/ [R=301,L]
+        RewriteRule ^/$ https://berlin.freifunk.net/en/ [R=302,L]
+        RewriteRule ^/index_en/$ https://berlin.freifunk.net/en/ [R=301,L]
         RewriteRule ^/network https://berlin.freifunk.net/de/map/ [R=301,L]
         RewriteRule ^/contact/$ https://berlin.freifunk.net/de/contact/ [R=301,L]
         RewriteRule ^/contact_en/$ https://berlin.freifunk.net/en/contact/ [R=301,L]
@@ -18,6 +20,10 @@
         RewriteRule ^/wiki/$ https://berlin.freifunk.net/de/wiki/ [R=301,L]
         RewriteRule ^/meshwiki$ https://berlin.freifunk.net/de/wiki/ [R=301,L]
         RewriteRule .* https://berlin.freifunk.net%{REQUEST_URI} [R=301,L]
+
+        <LocationMatch "^/$">
+                Header always merge Vary "Accept-Language"
+        </LocationMatch>
 </VirtualHost>
 
 <VirtualHost *:443>
@@ -29,8 +35,10 @@
         SSLCertificateKeyFile   /etc/letsencrypt/live/www.berlin.freifunk.net/privkey.pem
 
         RewriteEngine On
+        RewriteCond %{HTTP:Accept-Language} ^de [NC]
+        RewriteRule ^/$ https://berlin.freifunk.net/de/ [R=302,L]
         RewriteCond %{REQUEST_URI} !^/.well-known/
-        RewriteRule ^/$ https://berlin.freifunk.net/de/ [R=301,L]
+        RewriteRule ^/$ https://berlin.freifunk.net/en/ [R=302,L]
         RewriteRule ^/index_en https://berlin.freifunk.net/en/ [R=301,L]
         RewriteRule ^/network https://berlin.freifunk.net/de/map/ [R=301,L]
         RewriteRule ^/contact/$ https://berlin.freifunk.net/de/contact/ [R=301,L]
@@ -43,15 +51,25 @@
         RewriteRule ^/meshwiki$ https://berlin.freifunk.net/de/wiki/ [R=301,L]
         RewriteRule ^/impressum/$ https://berlin.freifunk.net/de/impressum/ [R=301,L]
 
+        <LocationMatch "^/$">
+                Header always merge Vary "Accept-Language"
+        </LocationMatch>
 </VirtualHost>
 
 <VirtualHost *:80>
 	ServerName www.berlin.freifunk.net
         ServerAdmin "[email protected]"
 
         RewriteEngine On
+        RewriteCond %{HTTP:Accept-Language} ^de [NC]
+        RewriteRule ^/$ https://berlin.freifunk.net/de/ [R=302,L]
         RewriteCond %{REQUEST_URI} !^/.well-known/
-        RewriteRule .* https://berlin.freifunk.net/de/ [R=301,L]
+        RewriteRule ^/$ https://berlin.freifunk.net/en/ [R=302,L]
+        RewriteRule .* https://berlin.freifunk.net/en/ [R=301,L]
+
+        <LocationMatch "^/$">
+                Header always merge Vary "Accept-Language"
+        </LocationMatch>
 </VirtualHost>
 
 <VirtualHost *:443>
@@ -65,8 +83,10 @@
         DocumentRoot /var/www/berlin.freifunk.net/www
 
         RewriteEngine On
+        RewriteCond %{HTTP:Accept-Language} ^de [NC]
+        RewriteRule ^/$ https://berlin.freifunk.net/de/ [R=302,L]
         RewriteCond %{REQUEST_URI} !^/.well-known/
-        RewriteRule ^/$ https://berlin.freifunk.net/de/ [R=301,L]
+        RewriteRule ^/$ https://berlin.freifunk.net/en/ [R=302,L]
         RewriteRule ^/index_en https://berlin.freifunk.net/en/ [R=301,L]
         RewriteRule ^/network https://berlin.freifunk.net/de/map/ [R=301,L]
         RewriteRule ^/contact/$ https://berlin.freifunk.net/de/contact/ [R=301,L]
@@ -78,6 +98,10 @@
         RewriteRule ^/wiki/$ https://berlin.freifunk.net/de/wiki/ [R=301,L]
         RewriteRule ^/meshwiki$ https://berlin.freifunk.net/de/wiki/ [R=301,L]
 
+        <LocationMatch "^/$">
+                Header always merge Vary "Accept-Language"
+        </LocationMatch>
+
 	Header set Content-Security-Policy "script-src berlin.freifunk.net"
 	Header set Strict-Transport-Security "max-age=63072000; includeSubDomains"