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Specify realnames must not be empty. #114

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Sep 5, 2021
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Specify realnames must not be empty. #114

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Specify realnames must not be empty.
progval Aug 13, 2021
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Update index.md
progval Aug 17, 2021
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Expand Up @@ -708,6 +708,7 @@ It must be noted that `<realname>` must be the last parameter because it may con
Since it is easy for a client to lie about its username by relying solely on the `USER` command, the use of an "Identity Server" is recommended. This lookup can be performed by the server using the [Ident Protocol](http://tools.ietf.org/html/rfc1413). If the host which a user connects from has such an "Identity Server" enabled, the username is set to that as in the reply from that server. If the host does not have such a server enabled, the username is set to the value of the `<username>` parameter, prefixed by a tilde `('~', 0x7E)` to show that this value is user-set.

The maximum length of `<username>` may be specified by the [`USERLEN`](#userlen-parameter) `RPL_ISUPPORT` parameter. If this length is advertised, the username MUST be silently truncated to the given length before being used.
The minimum length of `<username>` is 1, ie. it MUST not be empty. If it is empty, the server SHOULD reject the command with [`ERR_NEEDMOREPARAMS`](#errneedmoreparams-461) (even if an empty parameter is provided); otherwise it MUST use a default value instead.

The second and third parameters of this command SHOULD be sent as one zero `('0', 0x30)` and one asterisk character `('*', 0x2A)` by the client, as the meaning of these two parameters varies between different versions of the IRC protocol.

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