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Remove language-specific callouts for x-fern-default #5233

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Merged
devalog merged 1 commit into from
Apr 29, 2026
Merged

Remove language-specific callouts for x-fern-default #5233

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6 changes: 1 addition & 5 deletions fern/products/api-def/openapi/extensions/default.mdx
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Expand Up @@ -6,11 +6,7 @@ description: Use `x-fern-default` to set client-side default values for path, he

The `x-fern-default` extension lets you specify a client-side default value for a path, header, or query parameter, including headers defined under [`x-fern-global-headers`](/learn/api-definitions/openapi/extensions/global-headers). When present, the generated SDK makes the parameter optional and automatically sends the default value if the caller omits it. `x-fern-default` supports `string` and `boolean` values; other types (such as numbers) are ignored.

This is useful for pinning an API version header or a region path parameter while still allowing callers to override the value.

<Note title="Supported languages">
`x-fern-default` is supported for TypeScript, Python, Go, Java, C#, PHP, and Ruby SDKs.
</Note>
This is useful for pinning an API version header or a region path parameter while still allowing callers to override the value. `x-fern-default` is supported across all SDK languages.

## Path parameters

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2 changes: 1 addition & 1 deletion fern/products/sdks/deep-dives/generated-sdk.mdx
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Expand Up @@ -49,7 +49,7 @@ When you define webhooks in your API spec, Fern automatically [generates utiliti

## Default parameter values

You can configure [default values](/learn/api-definitions/openapi/extensions/default-values) for path, header, and query parameters, including headers defined under [`x-fern-global-headers`](/learn/api-definitions/openapi/extensions/global-headers). The SDK makes those parameters optional and sends the default when the caller doesn't provide one — useful for things like pinning an API version header or default region. Supported in TypeScript, Python, Go, Java, C#, PHP, and Ruby SDKs.
You can configure [default values](/learn/api-definitions/openapi/extensions/default-values) for path, header, and query parameters, including headers defined under [`x-fern-global-headers`](/learn/api-definitions/openapi/extensions/global-headers). The SDK makes those parameters optional and sends the default when the caller doesn't provide one — useful for things like pinning an API version header or default region.

## Customization options

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