I have an app where the user uploads a large photo using web2py's normal 
upload mechanism. After that, the program needs to do some image 
manipulation, upload it to cloudfiles, and update the db when it's 
complete. But I don't want to require the user to wait around for all that 
to finish before receiving a response. 

What are the options for getting a response back when the initial upload 
completes, yet at the same time kicking off an async process that finishes 
the job of processing the image on the server side?

(I could use the scheduler, but I'm wondering if there's a more basic 
approach for this type of case)

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