barthat on "[Plugin: Autoptimize] Headers"

Yes, That was helpful thanks.

I still don't understand why I get "The ETag header's syntax isn't valid." for this header Last-Modified: Fri, 23 Aug 2013 10:18:55 GMT.

I fixed my other headers issues with this

<FilesMatch "^autoptimize_.*\.php$">
	Header unset Cache-Control
	Header merge Cache-Control "proxy-revalidate"
	</FilesMatch>