How does that help when your content is in Cloud Storage? Is there an app which serves content out of Cloud Storage and runs on app engine? (I haven't worked with app engine)
You can set caching headers on Cloud Storage also. But that doesn't help when
1. you have a large number of requests with cold cache
2. want the flexibility to keep cache time small. Unlike cloudfront there is no purge method in GCS. GCS doesn't guarantee to serve new versions until the old one's cache time has expired.
http://stackoverflow.com/questions/5617322/how-to-enable-cac...