get_serving_url()
Pros:
 - serves from a high-performance CDN (presumably)
 - allows me to specify sizes dynamically "=s180", generating and caching 
the resulting image
 - offloads b/w costs away from my GAE app (probably an overall minimal 
gain)
Cons:
 - serves off-domain and does not participate in PageSpeed optimizations

PageSpeed Service
Pros:
 - does a bunch of on-the-fly image optimizations automatically
Cons:
 - requires me to serve an image on-domain, so I need to read and serve the 
image from Cloud Storage via blobstore API
 - since I'm serving the blob myself, I can't dynamically specify a size - 
or at least I need to build up the bits to generate and cache the re-sized 
image on my own
 - uncheap (though not my primary concern)

Am I understanding this correctly? Does anyone know of a way to get the 
best of both worlds? Specifically, I want to be able to store raw images in 
Cloud Storage, and then serve them out with dynamic sizings, but also have 
PageSpeed work its magic on the served image.

Possible? Maybe someday?

Thanks for any info,
j

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