On Thu, 2010-02-18 at 18:15 +0100, Guilhem Bonnefille wrote:
> Hi all,
>
> 2010/2/18 Jocelyn Jaubert <jocelyn.jaub...@gmail.com>:
> > I will look tonight if it is simple to use ETag with viking and
> > libcurl - it should only be a matter of adding "file.etag" alongside
> > the image file.
>
> Perhaps can we store this ETag *in* the image. PNG file supports text
> data to be stored in. gdb-pixbuf library allows to deal with this
> info.
> IMHO, storing ETag in the image file would be better for consistency:
> a single file to manage, like any other tile source.
>
It you wanted to implement something specifically for mod_tile then you
could just calculate the md5sum of the file to regenerate the ETag
value. This would be completely non-portable and I would not recommend
doing it like this except perhaps as a quick experiment.
Other servers may generate the ETag using a completely different method.
The Apache "FileETag" directive lets you generate the ETag from an
arbitrary combination of the file size, timestamp and filesystem inode.
Jon
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