Features
- https_redirect can be called per connection (Jianhui Zhao)
- add an api to judge whether the conn was closed (Jianhui Zhao)
Chores
- fix FindLibuhttpd.cmake (Jianhui Zhao)
- ssl: sync from upstream (Jianhui Zhao)
- ssl: sync from upstream (Jianhui Zhao)
- bump version 3.14.1 (Jianhui Zhao)