mod_http_oauth2: Validate redirect URI depending on application type Per https://openid.net/specs/openid-connect-registration-1_0.html require that web applications use https:// and native applications must use either http://localhost or a custom (non-https) URI. Previous requirement that hostname matches that of client_uri is kept for web applications.

Over the years, some servers stop working for various reasons, and leave
behind broken roster subscriptions that trigger failing s2s connections.
This module allows cleaning up such cases by unsubscribing local users
from their contacts on those servers. Also works for typos and the like.
Use with care.

```lua
Component "gmail.com" "unsubscriber"
```