anchor.diff:  ### Retrieve User [GET]
   Return the information for the User
   
  -+ Response 200 (application/json)
  ++ Response 200
   
       [User][]
   
  
positive.code: 
  ### List all users [GET]
  
  + Response 200 (application/json)
  
      [User Collection][]
  
  
negative.code: 
  ### List all sessions [GET]
  
  + Response 200
  
      [Session Collection][]