The desired DSL.  Fails thusly:

[info] java.lang.ClassCastException: java.lang.String cannot be cast to scala.util.continuations.ControlContext
[info] 				     at scala.util.continuations.package$.reset(package.scala:133) ~[scala-library-2.10.3.jar:na]
[info] 				     at org.http4s.examples.ScalatraExample$$anonfun$2.apply(ScalatraExample.scala:15) ~[classes/:na]