[mapserver-dev] Cache-control in WMS Requests

Paul Ramsey pramsey at cleverelephant.ca
Tue Mar 18 16:11:26 EDT 2008

First time I really noticed it, and one of the annoyances of IE6 was
always that it appeared to load the off-screen stuff first :)
Everything is hard to quantify... I noticed after writing the post
that Safari appeared to cache the images REGARDLESS of the
cache-control header.  And then FF seemed to start ignoring the header
and requesting tiles every time, then it flipped back and started

I think the moral of the story is to do the right thing (express your
desired behavior) then cross your fingers and hope. Better than

On the HTTP 1.0 versus 1.1 debate, I found this post interesting. I
think the behavior as it stands is probably good enough.



On 3/18/08, Christopher Schmidt <crschmidt at metacarta.com> wrote:
> On Tue, Mar 18, 2008 at 11:59:58AM -0700, Paul Ramsey wrote:
>  > Also on IE7.
>  >
>  > BTW, Firefox 3 loads the tiles in an attractive spiral from the center
>  > out, probably the order desired by the clever openlayers developers,
>  > but oft ignored by other browsers.
> Really? I've definitely seen Spirals in FF2, Safari, and IE... though to
>  be honest, I see it much less these days, since I'm always using the
>  multi-hosts DNS trick to accelerate loading (which leads to loads being
>  parallelized, and thus you get lots of chunks of the 'spiral' at the
>  same time).
>  Regards,
> --
>  Christopher Schmidt
>  MetaCarta
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