anchor.diff:  of handler that uses manifold streams is very easy.
   
   
  -=== Ring compatibility
  +=== Ring (Compatibility layer)
   
   Although ring support is not first citizen in _catacumba_, the current design of it allows to create an
   handler adapter that follows the ring specification. This is a great example of extensibility of
  
positive.code: support for different kind of coercions and with clojure 1.7 *transducers*.
  
  
  === WebSockets
  
  One of the main goals of _catacumba_ is come with builtin, full featured and backpressure-aware
  websockets support.
  
negative.code: In the example above, the second handler prints the message found in the context.
  
  
  == Handler types
  
  This section intends to explain the different kind of builting handler types.
  
  === Asynchronous
  
  Asynchronous handlers are handlers that return a value in an asynchronous way using one of the
  supported abstractions, such as core.async, reactive-streams and many others (explained below).
  