30 lines
1.3 KiB
Markdown
30 lines
1.3 KiB
Markdown
---
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title: API previews
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intro: You can use API previews to try out new features and provide feedback before these features become official.
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redirect_from:
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- /v3/previews
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versions:
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ghes: <3.4
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topics:
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- API
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---
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API previews let you try out new endpoints and changes to existing endpoints before they become part of the official {% data variables.product.prodname_dotcom %} API.
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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](https://developer.github.com/changes/) without advance notice.
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To access an API preview, you'll need to provide a custom [media type](/rest/overview/media-types) in the `Accept` header for your requests. Feature documentation for each preview specifies which custom media type to provide.
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{% ifversion ghes < 3.4 %}
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## Content attachments
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You can now provide more information in {% data variables.product.prodname_dotcom %} for URLs that link to registered domains by using the API to manage {% data variables.product.prodname_unfurls %}. For more information, see "[Using content attachments](/apps/using-content-attachments/)."
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**Custom media types:** `corsair-preview`
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**Announced:** [2018-12-10](https://developer.github.com/changes/2018-12-10-content-attachments-api/)
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{% endif %}
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