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API previews

You can use API previews to try out new features and provide feedback before these features become official.

API previews let you try out new APIs and changes to existing API methods before they become part of the official GitHub API.

During the preview period, we may change some features based on developer feedback. If we do make changes, we'll announce them on the developer blog without advance notice.

To access an API preview, you'll need to provide a custom media type in the Accept header for your requests. Feature documentation for each preview specifies which custom media type to provide.

Pre-receive environments

Create, list, update, and delete environments for pre-receive hooks.

Custom media type: eye-scream-preview Announced: 2015-07-29

Global webhooks

Enables global webhooks for organization and user event types. This API preview is only available for GitHub Enterprise Server.

Custom media type: superpro-preview Announced: 2017-12-12

Anonymous Git access to repositories

When a GitHub Enterprise Server instance is in private mode, site and repository administrators can enable anonymous Git access for a public repository.

Custom media type: x-ray-preview Announced: 2018-07-12

Content attachments

You can now provide more information in GitHub for URLs that link to registered domains by using the Content Attachments API. See "Using content attachments" for more details.

Custom media types: corsair-preview Announced: 2018-12-10