Just use the "Live HTTP headers" Firefox add-on. Look for HTTP code
"304 Not Modified" after refreshing a page. If you don't see it, your
cache headers aren't being set properly.

It could be the case that your load-tester is not obeying HTTP or not
providing accurate simulations of real-world scenarios. Even if you
have lots of hits, many of them will be repeat hits from users who
already have your static content cached locally.



On Feb 18, 5:34 pm, Anekdotz <[email protected]> wrote:
> From reading other threads I was under the impression that AppEngine
> sets cache headers automatically if you define static directories in
> app.yaml..  Am I misinformed?
>
> Arjun
>
> On Feb 18, 2:59 pm, "Ikai L (Google)" <[email protected]> wrote:
>
>
>
> > Do you have cache headers for your assets? This'll cause browsers not to try
> > to redownload them for repeat visitors - this is a good practice in general
> > for fast websites.
>
> > On Wed, Feb 17, 2010 at 7:11 PM, Anekdotz <[email protected]> wrote:
> > > I recently stress tested my app with some troublesome results.  While
> > > the CPU, Datastore and Memcache quotas were barely consumed, my
> > > Outgoing Bandwidth quota was used approximately 30 times as much.
> > > I.e. for usage of 1% CPU I had used 28% of my bandwidth quota.
>
> > > The vast majority of the bandwidth was used for static files (image/
> > > css/javascript).  I've heavily optimized most operations so this is
> > > kind of annoying.  Also, since my app does not store large files for
> > > download, I feel like I'm "wasting" this resource with respect to the
> > > others.
>
> > > I'm thinking of moving these files to another location, like storing
> > > them on google sites or google code.  Since these aren't optimized for
> > > serving files I would like to use appengine to serve them until the
> > > bandwidth quota is getting close to depleted and then dynamically
> > > switching to the external services.  For this I would need to
> > > programmatically determine how much bandwidth is being used, but
> > > unfortunately the Quota API seems to only provide CPU usage.
>
> > > Does anyone know of a way to do this?  Or if you have any better ideas
> > > on preserving bandwidth with respect to the other resources, I'm all
> > > ears.
>
> > > Thanks,
> > > Arjun
>
> > > --
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>
> > --
> > Ikai Lan
> > Developer Programs Engineer, Google App 
> > Enginehttp://googleappengine.blogspot.com|http://twitter.com/app_engine

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