-# compress html output if accepted by client
-<IfModule deflate_module>
-AddOutputFilterByType DEFLATE text/html
-</IfModule>
+# replace jpeg images by webp alternatives if supported
+RewriteCond %{HTTP_ACCEPT} \bimage/webp
+RewriteCond %{DOCUMENT_ROOT}/$1.webp -f
+RewriteRule (.*)\.jpg$ $1.webp