google app engine - unable to set cache expiration on in app.yaml for a python app -

in gae app serving static content follows (those entries in app.yaml file):

handlers: - url: /css   static_dir: static/css   expiration: "10m"  - url: /js   static_dir: static/js   expiration: "10m" 

despite information available here: https://developers.google.com/appengine/docs/python/config/appconfig#expiration content never cached in browser regardless whether use dev server or upload app.

i using chrome , request header is:

cache-control:max-age=0 

and response headers are:

cache-control:no-cache, must-revalidate pragma:no-cache server:google frontend status:304 not modified 

as per answers able find, tested both being logged in , out google admin account , nothing changes.

any on appreciated. many thanks!

response headers when logged out of admin account:

date:fri, 25 apr 2014 09:54:44 gmt etag:"lhoiow" server:google frontend status:304 not modified version:http/1.1 

gae should work fine 10m value. because signed in google admin account. gae returns no-cache such accounts. trying opening same page in incognito returns proper cache expiry times.

by default gae sets cache 10 minutes, if didn't set expiry - should see 10 minutes instead of no-cache.