Cache-control in google app engine

Question

I'm trying to optimize page serving time on Google app engine, but I'm struggling at getting the effect I want.

in my app.yaml, I used the following directive:

handlers:
- url: /assets
  static_dir: assets
  expiration: 7d

under the asset folder, I have all my images, css and js. By using the 7d expiration, I would have expected the browser to use the local cached files and not come to my app for 7 days.

Although, in the response headers for my assets I get the following:

Cache-Control:public, max-age=604800
Cache-Control:no-cache, must-revalidate

I understand that with these headers, the browser will check on my app if the file as changed before releasing the cached version. (I can effectively see a bunch of 304 corresponding to my files under the asset folder, for both refresh and simple page load).

Is there a way in Google app engine to configure the cache behavior so the browser will not comeback for those files for 7d (on a simple page load), as specified in the expiration? (i.e. removing the "no-cache" from cache-control header)

P.S. I dont want to enable PageSpeed on my app. I want full control on the html served.

Answer 1

Are you logged on with an Admin-account by any chance? AppEngine adds some private headers about the costs for Admins and disables caching because that data is private. Logging out solved the problem for me.