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797ec6ede5
Define a new set of CLI commands publish/unpublish backend <be>. The objective is to be able to change the status of a backend to unpublished. Such a backend is considered ineligible to traffic : this allows to skip use_backend rules which target it. Note that contrary to disabled/stopped proxies, an unpublished backend still has server checks running on it. Internally, a new proxy flags PR_FL_BE_UNPUBLISHED is defined. CLI commands handler "publish backend" and "unpublish backend" are executed under thread isolation. This guarantees that the flag can safely be set or remove in the CLI handlers, and read during content-switching processing.