- Add ``history`` attribute of the response with all response objects
- Add ``links`` attribute of the response with the parsed link header if set
- Change logging level in a few places to a more appropriate level
- Add support for rejected consumers when auto-creating the ``User-Agent`` header
- Add the netloc of a request to the log entry created when rate limited
- Use RequestHandler.settings instead of RequestHandler.application.settings
when auto-creating the ``User-Agent`` header for a Tornado request handler
- Add test coverage of the Warning response header behavior