anchor.diff:  	BodyLen = iolist_size(Body),
   	ExtraLen = iolist_size(Extra),
   	TotalBodyLen = KeyLen + BodyLen + ExtraLen,
  -	[16#80,						% MAGIC
  +    [16#80,						% MAGIC
        mcache_proto:opcode(Opcode),	% Opcode
        <<KeyLen:16,					% Key length
          ExtraLen:8,				% Extra length
  
positive.code: 
  ab_delete(Server, Key) ->
  	gen_server:cast(get_client_pid(Server), {mc, {delete, Key}}).
  	
  
  % internal apis
  
  
negative.code: 
  process_resp(#resp{opcode=getk, status=Status, extra=Extra, key=Key, body=Value}) ->
      case Status of
          ok ->
              <<Flags:32>> = Extra,
              {ok, {Key, {Value, Flags}}};
          _ -> {ok, {Key, undefined}}
  