[typo] Per filter headers, whiteboards and fragment caching

Scott Laird scott at sigkill.org
Thu Jan 11 12:08:48 EST 2007

Out of curiosity, how will page caching work any better with extra
headers?  It doesn't store *any* HTTP headers at all on disk, even


On 1/5/07, Piers Cawley <pdcawley at bofh.org.uk> wrote:
> It turns out that fragment caching really doesn't play nicely with
> optional headers generated by the likes of the <typo:lightbox>
> filter. I'm not entirely sure about whether the workings of
> whiteboards are quite right either.
> So, until I've worked out what's going on, I shall be removing
> fragment caching. The file based page caching should continue
> to work though.
> So, I'm giving textfilters and whiteboards a long hard look. Right
> now, we're using class methods on the textfilter, but I think a better
> approach would be to instantiate them on a per request basis. The idea
> being that you use the same instance to format the contents of a page
> and then query the textfilter instances for required headers etc.
> This might be the first step to a callback based API for Typo
> extensions, but I'm making not promises.
> --
> Piers Cawley <pdcawley at bofh.org.uk>
> http://www.bofh.org.uk/
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