mod_http_oauth2: Validate the OpenID 'prompt' parameter Without support for affecting the login and consent procedure, it seems sensible to inform the client that they can't change anything with this parameter.

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

``` {.lua}
modules_enabled = {
    -- other modules --
    "s2s_blacklist",

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