Release 1.1.3.1 of Domino REST API introduces a breaking change in CORS handling. This makes configuration less straightforward, but as the documentation states, it increases the flexibility and probably makes things a lot easier for larger environments. And though regex is not something Domino developers work with regularly, there are tools close to home that can help.
This is a companion discussion topic for the original entry at https://paulswithers.github.io/blog/2025/05/01/drapi-cors-regex/