# with_user_agent_header

> **Function** in `langchain_elasticsearch`

📖 [View in docs](https://reference.langchain.com/python/langchain-elasticsearch/_utilities/with_user_agent_header)

## Signature

```python
with_user_agent_header(
    client: Elasticsearch,
    header_prefix: str,
) -> Elasticsearch
```

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[View source on GitHub](https://github.com/langchain-ai/langchain-elastic/blob/e78a327f38e09abd10128ed28c8774e9a8f9fec0/libs/elasticsearch/langchain_elasticsearch/_utilities.py#L35)