"Cache-Control: private" only uses the end user cache to cache
resources.

"Cache-Control: public" uses any downstream cache to cache resources
(including the browser cache).

Google has a downstream cache in front of App Engine requests, so if
you serve your resources with "Cache-Control: public", Google will
cache that resource. Subsequent hits are served from there, and I'm
pretty sure they won't even show in your request log at all.

j

On Dec 6, 3:19 pm, GONZO <gonzom...@gmail.com> wrote:
> Hi, first thanks for your attention and sorry for my English
> translation.
>
> I have a question that intrigues me a few weeks. This is the header
> "cache-control" in particular the behavior of the options "private"
> and "public" in Google App Engine.
>
> First of all, this is only to serve static files (css, js, etc)
>
> Let's go. With "cache-control: private" experiment curve normal
> traffic. But with "cache-control: public" experiment Traffic
> incredible savings. In both cases, everything seems to work well.
>
> The question is:
>
> 1. How can traffic be a big savings? Is reduced to 15%.
>
> 2. Saving you a real traffic? Or is something special instead of
> Google App Engine?
>
> Better look at this diagram 
> illustrates:http://gonzo.teoriza.com/almacen/cache-control.jpg
>
> Thanks in advance, I hope to be clarified.

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