# December 15, 2025

## 1.21.0

**`(feat):`** Add support for multi-URL environments via `x-fern-server-name` extension. APIs with multiple
base URLs per environment can now route different endpoints to different base URLs automatically.
The SDK generates a named `Environment` struct with fields for each base URL, and endpoints
resolve their base URL using the `ResolveEnvironmentBaseURL` function.