RewriteEngine On RewriteCond %{HTTP_ACCEPT} image/webp RewriteCond %{REQUEST_FILENAME} (.*)\.(jpe?g|png|gif)$ RewriteCond %{REQUEST_FILENAME}\.webp -f RewriteCond %{QUERY_STRING} !type=original RewriteRule (.+)\.(jpe?g|png|gif)$ %{REQUEST_FILENAME}.webp [T=image/webp,E=accept:1,L] Header append Vary Accept env=REDIRECT_accept AddType image/webp .webp