This makes them well suited for web support files like images of icons, but not so well suited for content files like photos to accompany a magazine article. In most cases, content served by your web application belongs in a content management system built into your app that separates the content publishing workflow from the application deployment workflow. Locally, static files sit with your app code in the app’s root directory.
You tell the deployment process and the frontend which of the application’s files are static files using app configuration. The deployment process reads the configuration and delivers the static files to the dedicated static file servers. The frontend remembers which URL paths refer to static files, so it can route requests for those paths to the appropriate servers. The static file configuration can also include a recommendation for a cache expiration interval.
App Engine returns the cache instructions to the client in the HTTP header along with the file. If the client chooses to heed the recommendation (and most web browsers do), it will retain the file for up to that amount of time, and use its local copy instead of asking for it again. This reduces the amount of bandwidth used, but at the expense of clients retaining old copies of files that may have changed.
To save space and reduce the amount of data involved when setting up new app instances, static files are not pushed to the application servers. This means application code cannot access the contents of static files by using the filesystem.
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