Rack-oauth2-sample-mac.heroku.com access issues may stem from misconfigured redirection settings across different versions. If so, the links below can serve as alternative ways to reach the site:

http://rack-oauth2-sample-mac.heroku.com https://rack-oauth2-sample-mac.heroku.com

Or return to the current status page of rack-oauth2-sample-mac.heroku.com.