# merge_headers

> **Function** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/sandbox/_helpers/merge_headers)

Merge request headers, giving precedence to overrides.

## Signature

```python
merge_headers(
    base_headers: Optional[Mapping[str, str]] = None,
    override_headers: Optional[Mapping[str, str]] = None,
) -> dict[str, str]
```

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[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/d6cd6082f09e7826a2d6afe444ae6119e61b82a6/python/langsmith/sandbox/_helpers.py#L33)