WsPuzzle: How do we use Itertees/Enumerators the right way in a Play web service?
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The puzzle can basically be expressed as "How do we create a web service that invokes another web service with a POST request and use the Play Iteratee/Enumerator framework to deliver the response"? 

The original code illustrates a lack of understanding of how the Concurrent.broadcast pair of Enumerator/Iteratee works. Comments in the code explain the flaw in understanding and why the solution addresses it. 

The solution illustrates how to create a web service that can POST to another web service, retrieve the results and send them back to the original client in a non-blocking, non-threaded way w/out having to read the whole response into memory first! 

This short solution illustrates the power and elegance of  Iteratees/Enumeratees/Enumerators in a concrete way within a functioning Play! web application. 

**Props to James Roper for clarifying how to implement this!**