Access Control
When the server first starts running, and detects that its database is uninitialised or has been deleted, it initialises a fresh database with the following resources:
a virtual host named /
a user named guest with a default password of guest,
granted full access to the / virtual host.
It is advisable to delete the guest user
or change the password to something private, particularly if your broker is
accessible publicly.
当服务器启动的并检测到它的数据库没有被初始化......
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