Control message
(重定向自Newgroup)
Control messages are a special kind of Usenet post that are used to control news servers. They differ from ordinary posts by a header field named Control
. The body of the field contains control name and arguments.
There are two historical alternatives to header field Control
. They are not supported by contemporary software and forbidden according to RFC 5537. However, the traditional format of the subject line is widely used in addition to the Control
header: the subject line consists of the word "cmsg" followed by control name and arguments.