anchor.diff:  ###### header description
   |Header Field|Description|Value|
   |---|---|---|
  -|Authentication|string, require| Authentication : Basic **apptoken**
  +|Authentication|string, require| Authentication : Basic **gamertoken**
   
   ###### response description
  -this request as the same response a the login request!
  +this request as the same response a the login request except for the fields gamerid and gamertoken which are missing!
  +
   
   + Request (application/json)
   
  
positive.code:         {
              "gamerid" : "identifier of the user" 
              "gamertoken" : "reusable token used by gamer related requests" 
          }
  
  + Response 401 (application/json)
  
negative.code:     
      * _for a non gamer route, `token` could be APISECRET:APIKEY, called **apptoken**_
      * _for a gamer route, `token` is the one returned by sign in/up methods which is an random-key in our cache (redis) pointing a json = { appid: xxx, userid: zzz, ... }, called **gamertoken**_
      
      _**this means we have 2 redis collections with gamertoken: logged users, revoke at logout, and "active" users in term of CCU, revoked by timeout or suspending app**_
  
  
  ## Gamer Session [/gamer/session]
  