add-cache-info vs. multipart/x-mixed-replace

Why doesn't add-cache-info get added here
when viewed in Firefox? Well it's some kind of
http://en.wikipedia.org/wiki/Server_push#HTTP_server_push technology,
$ set https://bugzilla.wikimedia.org/buglist.cgi?quicksearch=jidanni
$ firefox $@; wwwoffle-read $@
Content-Type: multipart/x-mixed-replace;boundary="------- =_aaaaaaaaaa0"

WARNING: YOUR BROWSER DOESN'T SUPPORT THIS SERVER-PUSH TECHNOLOGY...
$ wwwoffle $@; wwwoffle-read $@
Content-Type: text/html; charset=UTF-8 ...

So apparently in the first instance wwwoffle is not ready to deal with
multipart. Maybe it should put add-cache-info content into each of the
html parts?