mod_http_oauth2: Don't issue client_secret when not using authentication This is pretty much only for implicit flow, which is considered insecure anyway, so this is of limited value. If we delete all the implicit flow code, this could be reverted.

---
labels:
- 'Stage-Obsolete'
summary: Message Carbons
superseded_by: mod_carbons
...

Since Prosody 0.10, this module is [included in Prosody](https://prosody.im/doc/modules/mod_carbons), you will be redirected there shortly.