.htaccess

Options +FollowSymLinks
# Turn off MultiViews
Options -MultiViews

# Directive to ensure *.rdf files served as appropriate content type,
# if not present in main apache config
# AddType application/rdf+xml .rdf
AddType application/rdf+xml .owl
# AddType text/turtle .ttl

RewriteEngine on

#Rewrite rules for ALKIS vocabulary extension
RewriteCond %{HTTP_ACCEPT} !application/rdf\+xml.*(text/html|application/xhtml\+xml|text/\*|\*/\*)
RewriteCond %{HTTP_ACCEPT} text/html [OR]
RewriteCond %{HTTP_ACCEPT} application/xhtml\+xml [OR]
RewriteCond %{HTTP_ACCEPT} text/\* [OR]
RewriteCond %{HTTP_ACCEPT} \*/\* [OR]
RewriteCond %{HTTP_USER_AGENT} ^Mozilla/.*
RewriteRule ^$ https://tubav.github.io/alkis/  [R=303,NE,L]
RewriteCond %{HTTP_ACCEPT} ^.*application/rdf\+xml.* 
RewriteRule ^$ https://raw.githubusercontent.com/tubav/alkis/master/alkis.owl [R=303,NE,L]
# RewriteCond %{HTTP_ACCEPT} ^.*text/turtle.* 
# RewriteRule ^$ https://github.com/tubav/alkis/blob/master/alkis.ttl [R=303,NE,L]

#default response: owl
RewriteRule ^$ https://raw.githubusercontent.com/tubav/alkis/master/alkis.owl [R=303,NE,L]