Yes, that’s what I thought about. I don’t want to treat you as my “developer” but allow one question: I would like to inform my google bot about changes / no changes on my website. Do you know (or someone in this forum), if this header (the “if modified header”) is needed and supplied for the site, or is it supplied for each page and post.
The second question would then be: is the hook-element the right spot to place the “if modified” info?
Thanks.