以下に対応して短縮 URL を使用しないようにした。
Effective Friday, April 29, 2022 all links on git.io will stop redirecting. Please update any existing links that make use of the git.io URL service immediately.
2022-04-27 追記 リダイレクトされないようになるということは無くなったようです。
While the git.io url redirection service is read-only and use of the service is limited, we have received feedback from developers and academic researchers who have published git.io links in print documentation and research papers. In order to preserve the integrity of these historical documents, we have decided to archive the current git.io links in a new read-only service that will allow us to serve redirects for those links longer term.