code: def admin_startRPC(self, host='localhost', port=8545, cors=None, apis=None):
          
          if cors is None:
              cors = []
          if apis is None:
              apis = ['eth', 'net', 'web3']
  
          return (yield from self.rpc_call('admin_startRPC',
                                           [host, port,
                                            ','.join(cors), ','.join(apis)]))
docs: https://github.com/ethereum/go-ethereum/wiki/Management-APIs#admin_startrpc
  
          :param host: Network interface to open the listener socket (optional)
          :type host: str
  
          :param port: Network port to open the listener socket (optional)
          :type port: int
  
          :param cors: Cross-origin resource sharing header to use (optional)
          :type cors: str
  
          :param apis: API modules to offer over this interface (optional)
          :type apis: str
  
          :rtype: bool