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fern-support merged 1 commit into from
Jan 29, 2026
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Update changelogs from fern repo #3343

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14 changes: 14 additions & 0 deletions fern/products/sdks/overview/csharp/changelog/2026-01-28.mdx
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## 2.19.5
**`(fix):`** Fix missing client-level headers for endpoints without endpoint-specific headers.

Previously, endpoints that didn't have endpoint-specific headers (like custom request headers)
would not include client-level headers (API key, SDK version, additional headers) in their
HTTP requests. This caused authentication failures for APIs that rely on headers set at the
client level.

The fix ensures that all endpoints now properly merge headers from:
* Client options headers (API key, SDK version, etc.)
* Client additional headers (user-provided at client construction)
* Request options additional headers (user-provided per-request)


## 2.19.4
**`(fix):`** Fix missing `[Optional]` and/or `Nullable` attributes on generated properties with defaults.

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