# Omit

> **Class** in `langsmith`

📖 [View in docs](https://reference.langchain.com/python/langsmith/_openapi_client/_types/Omit)

To explicitly omit something from being sent in a request, use `omit`.

```py
# as the default `Content-Type` header is `application/json` that will be sent
client.post("/upload/files", files={"file": b"my raw file content"})

# you can't explicitly override the header as it has to be dynamically generated
# to look something like: 'multipart/form-data; boundary=0d8382fcf5f8c3be01ca2e11002d2983'
client.post(..., headers={"Content-Type": "multipart/form-data"})

# instead you can remove the default `application/json` header by passing omit
client.post(..., headers={"Content-Type": omit})
```

## Signature

```python
Omit()
```

---

[View source on GitHub](https://github.com/langchain-ai/langsmith-sdk/blob/33995e14a84c53b65b82482b3d2fe0624b379bda/python/langsmith/_openapi_client/_types.py#L163)