Prefetching a page from backend after timeout/purge

[Poul-Henning Kamp]

In message <45257776.7060002 at giraffen.dk>, Anton Stonor writes:
>Varnish looks very promissing--thank you guys for making it happen.
>
>A small question: I've been playing around with VCL and would like 
>Varnish to prefetch a fresh page from the backend after a timeout. The 
>idea is to spare the end user from waiting for a slow backend the first 
>time a page gets fetched after a timeout/purge.
>
>Should'nt this ...
>
>sub vcl_timeout {
>     fetch;
>}
>
>... do the trick? It doesn't seem to do what I expect.

Yes, but it's not implemented yet.

>The same issue when it comes to PURGE. I was hoping you could sneak a 
>"fetch" in here, but it doesn't work.

No, fetch is not a legal action in vcl_hit.

Maybe it should be, but it isn't right now.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.