mod_http_oauth2: Allow omitting application type for native apps This derives "application_type":"native" from the first redirect URI when registering a client, so that it can be omitted without the default value of "web" causing the very same redirect URIs to be rejected.

This module lets you block connections to any remote servers not on a
whitelist.

``` {.lua}
modules_enabled = {
    -- other modules --
    "s2s_whitelist",

}
s2s_whitelist = {
    "example.org",
}
```