Yes, they have the proper Expires headers. As described in http://stackoverflow.com/questions/4406651/webkit-etags-and-google-app-engine-caching-behavior, it appears as though expires is overruled by the Etags header and its need to send an If-None-Match request.
On Dec 15, 12:31 pm, 风笑雪 <kea...@gmail.com> wrote: > It works fine with Chrome 7 and Safari 5 on Windows XP in my app, no any > requests are sent after the first visiting. > > Have you checked the static files if they had an "Expires" header? > > Also don't enable resource tracking for webkit which will always request for > all the resources, just check the background logs. > > ---------- > keakon > > My blog(Chinese):www.keakon.net > Blog source code:https://bitbucket.org/keakon/doodle/ > > > > > > > > On Wed, Dec 15, 2010 at 9:50 AM, kamens <kam...@gmail.com> wrote: > > Situation: running a Google App Engine site with my static content's > > default_expiration set to "14d" > > > Problem: in Chrome and Safari, visiting a URL (not reloading, just > > putting the cursor in the address bar and hitting Enter), causes a ton > > of requests to be fired with If-None-Match headers. The responses are > > always 304 Not Modified, as expected. I can watch these requests get > > fired in a debugging proxy like Charles or Fiddler. > > > Want: to avoid these requests and 304 responses entirely for static > > content -- simply trust the browser's cached content when it's > > available. > > > We use the standard "cache static content for a really long time, > > we'll take care of appending ?version={version} modifications to our > > query strings when we need to bust the cache" system, so we'd really > > like to avoid the 304's. > > > Belief: I think this is caused by the etag header that app engine > > sends down with every static content response. The app engine SDK does > > not send this header down, and I don't see this 304 behavior when > > messing around with the SDK. > > > Any advice? Can you turn off etags for app engine's static content? > > > Updated with an example piece of static content: > >http://www.khanacademy.org/stylesheets/default.css?846.34680903661739... > > > See a full summary of this question and various responses here: > > >http://stackoverflow.com/questions/4406651/webkit-etags-and-google-ap... > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google App Engine" group. > > To post to this group, send email to google-appeng...@googlegroups.com. > > To unsubscribe from this group, send email to > > google-appengine+unsubscr...@googlegroups.com<google-appengine%2Bunsubscrib > > e...@googlegroups.com> > > . > > For more options, visit this group at > >http://groups.google.com/group/google-appengine?hl=en. -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appeng...@googlegroups.com. To unsubscribe from this group, send email to google-appengine+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en.
