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I'll repeat it: 1. Those two RewriteConds are only applying to the first RewriteRule. 2. Better than repeating those two RewriteConds six times, you should have all !-f !-d URLs go through function.php. Then it looks at the URL and determines which func/lang+func/lang+func+sub/whatever to use, like how the .htaccess is trying to do now. 3. You do not have any RewriteRules that will apply to /. That means Apache will use your index.html. AJAX is not authentication, you need all of this stuff for everything.