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Is there a way to turn on the Last-Modified header for static resources served up by Google App Engine? I have a large zip file that my app serves up to an iPhone client app, and I'd like to only download it if the Last-Modified date indicates that it is newer than the cached copy on the iPhone.
PS: I am using the Java version of Google App Engine.
Solution: I ended up writing a simple webapp to serve up my own static resources. Not hard to do. There is a small configuration step I had to do to get App Engine to serve static files, which is documented here.
Unfortunately, App Engine doesn't currently appear to support conditional gets for static resources. You might want to file a bug here about that.