> This page is for SDK, version Legacy.
> For other versions, use one of these documentation indexes:
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> - Legacy: https://buildwithfern.com/learn/sdks/legacy/llms.txt

> For clean Markdown content of this page, append .md to this URL. For the complete documentation index, see https://buildwithfern.com/learn/llms.txt. For task-scoped instructions for coding agents working in a Fern project, see https://buildwithfern.com/learn/home/fern-instructions.md.

## 2.15.1

**`(fix):`** 未检查的基础模型不再将 None 强制转换为类型。

### 已修复的问题

* 未检查的基础模型不再将 None 强制转换为类型。
* HTTP 客户端在 RequestOptions 中适当地默认空字段。