(self,data)
Override in subclass to buffer data for send to client

        It's okay if this method actually transmits the data; BaseHandler
        just separates write and flush operations for greater efficiency
        when the underlying system actually has such a distinction.
Override in subclass to buffer data for send to client
Override in subclass to buffer data for send to client
def _write(self,data):
        """Override in subclass to buffer data for send to client

        It's okay if this method actually transmits the data; BaseHandler
        just separates write and flush operations for greater efficiency
        when the underlying system actually has such a distinction.
        """
        raise NotImplementedError
def _write ( self , data ) : raise NotImplementedError