 client side supported feature, 'longpoll', 'coinbasetxn', 'coinbasevalue', 'proposal', 'serverlist', 'workid'
           ,...
       ],
       "rules":[            (array, optional) A list of strings
           "support"          (string) client side supported softfork deployment
           ,...
       ]
     }


Result:
{
  "version" : n,                    (numeric) The preferred block version
  "rules" : [ "rulename", ... ],    (array of strings) specific block rules that are to be enforced
  "vbavailab