anchor.diff:  
   %% Command: "s3-get-buckets"
   %%
  -handle_call(_Socket, <<?S3_ADD_BUCKET, Option/binary>> = Command, #state{formatter = Formatter} = State) ->
  +handle_call(_Socket, <<?S3_ADD_BUCKET, ?SPACE, Option/binary>> = Command, #state{formatter = Formatter} = State) ->
       Reply = case s3_add_bucket(Command, Option) of
                   ok ->
                       Formatter:ok();
  
positive.code: %%----------------------------------------------------------------------
  %% Command: "s3-create-user ${USER_ID} ${PASSWORD}"
  %%
  handle_call(_Socket, <<?S3_CREATE_USER, Option/binary>> = Command, #state{formatter = Formatter} = State) ->
      Reply = case s3_create_user(Command, Option) of
                  {ok, PropList} ->
                      AccessKeyId     = leo_misc:get_value('access_key_id',     PropList),
  
negative.code: 
  %% Command: "s3-set-endpoint ${END_POINT}"
  %%
  handle_call(_Socket, <<?S3_SET_ENDPOINT, ?SPACE, Option/binary>> = Command, #state{formatter = Formatter} = State) ->
      Reply = case s3_set_endpoint(Command, Option) of
                  ok ->
                      Formatter:ok();
  