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With web auth (it may use basic scheme, may use digital, etc) you don't need a password to a whole domain. You may protect any path on your host. In most known (for me) web-servers.
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I can't understand, what do you mean, sorry. Direct access to scgi_port? It closed by firewall. Access to /RPC2 mount point? It protected by web-auth (and this point may be moved inside rutorrent directory, for example).
The bad part of basic auth is that you need password a whole domain, a single path doesnt do it.
With web auth (it may use basic scheme, may use digital, etc) you don't need a password to a whole domain. You may protect any path on your host. In most known (for me) web-servers.
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because SCGI is enabled for the whole domain
I can't understand, what do you mean, sorry. Direct access to scgi_port? It closed by firewall. Access to /RPC2 mount point? It protected by web-auth (and this point may be moved inside rutorrent directory, for example).