I always use the following method when uploading new application code.

I have two versions of the code: "dev" and "main"

"main" is the default version.

I upload the new code to the "dev" version and test if the update is
working by using the url

http://dev.appname.appspot.com

Then temporarily make "dev" the default version.

Upload the code to "main" and make "main" the default.

This method never failed for static content (css,js). I need to force
reload shift-ctrl-R the page to ignore the browser cache content.

If you apply a cache buster to your css link your users will see the
updated css immediate.

<link type="text/css" rel="stylesheet" href="/css/style.css?ver=20120104">

You need to change the string anytime you upload a new version. If you
use source version control you can use the version number of the css
file.

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