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Mention that servers may use ERR_NOSUCHCHANNEL instead of ERR_CHANOPRIVSNEEDED to conceal +s channels #247

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Mention that servers may use ERR_NOSUCHCHANNEL instead of ERR_CHANOPRIVSNEEDED to conceal +s channels #247

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Mention that servers may use ERR_NOSUCHCHANNEL instead of ERR_CHANOPR…
progval Feb 20, 2025
b44e8d2
Mention ERR_NOTONCHANNEL too, as many servers do that
progval Feb 21, 2025
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3 changes: 3 additions & 0 deletions _includes/modern-appendix.md
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Expand Up @@ -149,6 +149,9 @@ This channel mode controls whether the channel is 'secret', and does not have an

A channel that is set to secret will not show up in responses to the {% message LIST %} or {% message NAMES %} command unless the client sending the command is joined to the channel. Likewise, secret channels will not show up in the {% numeric RPL_WHOISCHANNELS %} numeric unless the user the numeric is being sent to is joined to that channel.

Additionally, servers may return {% numeric ERR_NOSUCHCHANNEL %} instead of {% numeric ERR_CHANOPRIVSNEEDED %} or {% numeric ERR_NOTONCHANNEL %} to channel commands ({% message MODE %}, {% message TOPIC %}, {% message PRIVMSG %}, {% message NOTICE %}) to a secret channel from a user not on that channel.
This allows servers to further conceal the channel's existence silently (as the only other way to reveal a channel is then to {% message JOIN %} it, which notifies channel members on success).

### Protected Topic Mode

This mode is standard, and the mode letter used for it is `"+t"`.
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