'channel' is a more advanced version of 'port' option that enables you to fully select what streams the HTTP server will open in order to get connected to a client.
This option has been included for completeness, but I don't know if somebody will ever use it.

An example:

pliant module /pliant/protocol/http/server.pli command 'http_server channel { gvar Array:Str channels ; channels += "tcp:/server/6789" ; channels }'