anchor.diff:  }
   -------------------------------------------
   
  -==== Request validation
  +=== Request validation
   
   As an additional feature on the request object, you can validate incoming parameters. Just like
   <<Form handling>> you can access a Validator class, which can perform specific checks on the request
  
positive.code: Once you set this new version, the authentication cookie on the client side will be invalidated and
  the user gets a new authentication cookie with the new version once he signs in again.
  
  [WARN]
  Be very careful with this feature, as it directly effects the user experience of your users.
  
  == ETag for dynamic content
  
negative.code: 
  ----------------------------------
  
  NOTE:
  The Form class is only available if the request is mapped as a POST or PUT method.
  
  The Form class is automatically available in the template so you don't
  