> This page is for SDKs, version Legacy.
> For other versions, use one of these documentation indexes:
> - Current (default): https://buildwithfern.com/learn/sdks/current/llms.txt
> - 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.

## 4.40.0

**`(feat):`** Add support for X-RateLimit-Reset header
Retry strategy matches other SDKs (1s initial delay, 60s max delay).

## 4.39.2

**`(fix):`** More fixes and improvements to wire tests.

## 4.39.1

**`(fix):`** Various fixes and improvements to wire tests.

## 4.39.0

**`(feat):`** Add environment_class_name config option to customize the environment class name. Default remains `{ClientName}Environment`.