If you'll want to update your objects frequently, we recommend that you primarily use object versioning for the following reasons: For more information about object versioning, see Updating Existing Objects Using Versioned Object Names.
If you want to invalidate multiple objects such as all of the objects in a directory or all of the objects whose names begin with the same characters, you can include the wildcard, see Invalidation paths.
You can submit a specified number of invalidation paths each month for free.
In such a case, a processor changes a memory location and then invalidates the cached values of that memory location across the rest of the computer system.
Cache invalidation can be used to push new content to a client.
If you want to invalidate selected objects but your users don't necessarily access every object on your origin, you can determine which objects viewers have requested from Cloud Front and invalidate only those objects.
To determine which objects viewers have requested, enable Cloud Front access logging.
The call to get Session(false) never returns null but all attributes associated with the session object returned are null.
I currently detect if a user is logged out by searching for null attributes but this doesn't seem right.
There might be something else running in between (after invalidate and before getsession), which is creating the session.
Are you using plain servlets or something else also (specially the one that requires session, e.g.
Once you've invalidated an NSTimer, you shouldn't use it again.
Instead, create a new timer instance, and use that instance to add to the NSRun Loop's add Timer method.
Important You can invalidate most types of objects that are served by a web distribution, but you cannot invalidate media files in the Microsoft Smooth Streaming format when you have enabled Smooth Streaming for the corresponding cache behavior.