mod_rest: Catch one (1) reply to a POST-ed stanza from an internal source This will primarily cover error replies, and only those generated by the same Prosody instance using the `origin.reply()` method.

This module lets you block connections to remote servers at the s2s
level.

``` {.lua}
s2s_blacklist = {
    "proxy.eu.jabber.org",
}
```