anchor.diff:  context instances also implements that protocol for make things more easy.
   
   A good demostration of it, is using the clojure `slurp` function. It uses `clojure.java.io` abstractions
  -behind the scenes and seerves as helper for read some resource as string:
  +behind the scenes and serves as helper for read some resource as string:
   
   [source, clojure]
   ----
  
positive.code: === First handler
  
  The handler consists in a function that accepts a "context" as first parameter and
  returns something rederable. Let see an example:
  
  [source, clojure]
  ----
  
negative.code:     (http/ok body)))
  ----
  
  If you don't know the behavior of slurp, it reads the content of the provided resource as string
  and return it.
  
  
  ===== Headers
  