Thank you, Markus! Just in case others run into the same problem, here's the solution to the problem: RewriteCond %{HTTP_HOST} ^dev\.example\.com$ RewriteRule (.*) $1 [E=TYPO3_CONTEXT:Development] RewriteCond %{HTTP_HOST} ^www\.example\.com$ RewriteRule (.*) $1 [E=TYPO3_CONTEXT:Production]