Rokka System

>>85 確かにオプションは廃止してもいいですよね。

Here is a dat file on the client.

1 post A
2 post B
3 post C: that contains inappropriate words
4 post D
5 post E

Here is an up-to-date file on the sever.

1 post A
2 post B
3 post D
4 post E
5 post F
6 post G
7 post H
8 post I

The post C has been deleted by the administrator.
The client requires "6-". And the server returns as below.

6 post G
7 post H
8 post I

Now the file on the client is as below.

1 post A
2 post B
3 post C: that contains inappropriate words
4 post D
5 post E
6 post G
7 post H
8 post I

The inappropriate POST C remains and POST F is missing.
This is the reason why <OPTIONS> should not be used.