Some API previews have graduated and are now an official part of the API. These preview headers are no longer required.
gambit preview graduates
The "Delete an installation" endpoint no longer requires the
For more information about this endpoint, see the "Delete an installation for the authenticated app."
shadow-cat preview graduates
To create a draft pull request or see whether a pull request is in a draft state, you no longer need to use the
For more information about the affected endpoints, see the "Pull Requests API."
Thanks again to everyone that tried out these API features during the preview period.