* ♻️ Do not accept underscore headers when using `convert_underscores=True` (the default). PR [#15589](https://github.com/fastapi/fastapi/pull/15589) by [@tiangolo](https://github.com/tiangolo).
* ♻️ Do not accept underscore headers when using `convert_underscores=True` (the default). PR [#15589](https://github.com/fastapi/fastapi/pull/15589) by [@tiangolo](https://github.com/tiangolo).