"size": "XL"
  }
}
```

#### FastAPI's `HTTPException` vs Starlette's `HTTPException`

**FastAPI** has its own `HTTPException`.

And **FastAPI**'s `HTTPException` error class inherits from Starlette's `HTTPException` error class.

The only difference is that **FastAPI**'s `HTTPException` accepts any JSON-able data for the `detail` field, while Starlette's `HTTPException` only accepts strings for it.

        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item_id not in fake_db:
        raise HTTPException(status_code=404, detail="Item not found")
    return fake_db[item_id]


@app.post("/items/", response_model=Item)
async def create_item(item: Item, x_token: str = Header()):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")

@app.get("/items/{item_id}", response_model=Item)
async def read_main(item_id: str, x_token: Annotated[str, Header()]):
    if x_token != fake_secret_token:
        raise HTTPException(status_code=400, detail="Invalid X-Token header")
    if item_id not in fake_db:
        raise HTTPException(status_code=404, detail="Item not found")
    return fake_db[item_id]


@app.post("/items/", response_model=Item)

    "title": "towel",
    "size": "XL"
  }
}
```

#### O `HTTPException` do FastAPI vs o `HTTPException` do Starlette.

O **FastAPI** tem o seu próprio `HTTPException`.

E a classe de erro `HTTPException` do **FastAPI** herda da classe de erro do `HTTPException` do Starlette.

A diferença entre os dois é a de que o `HTTPException` do **FastAPI** permite que você adicione *headers* que serão incluídos nas *responses*.

  }
}

```

### FastAPI `HTTPException` vs Starlette `HTTPException`

**FastAPI** 也提供了自有的 `HTTPException`。

**FastAPI** 的 `HTTPException` 继承自 Starlette 的 `HTTPException` 错误类。

它们之间的唯一区别是，**FastAPI** 的 `HTTPException` 可以在响应中添加响应头。

OAuth 2.0 等安全工具需要在内部调用这些响应头。

因此你可以继续像平常一样在代码中触发 **FastAPI** 的 `HTTPException` 。

但注册异常处理器时，应该注册到来自 Starlette 的 `HTTPException`。

    **FastAPI** uses them internally to achieve this.

## Dependencies with `yield` and `HTTPException`

You saw that you can use dependencies with `yield` and have `try` blocks that catch exceptions.

The same way, you could raise an `HTTPException` or similar in the exit code, after the `yield`.

!!! tip

from fastapi import Depends, FastAPI, HTTPException
from sqlalchemy.orm import Session

from . import crud, models, schemas
from .database import SessionLocal, engine

models.Base.metadata.create_all(bind=engine)

app = FastAPI()


# Dependency
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


@app.post("/users/", response_model=schemas.User)

from typing_extensions import Annotated

app = FastAPI()


async def verify_token(x_token: Annotated[str, Header()]):
    if x_token != "fake-super-secret-token":
        raise HTTPException(status_code=400, detail="X-Token header invalid")


async def verify_key(x_key: Annotated[str, Header()]):
    if x_key != "fake-super-secret-key":

    "size": "XL"
  }
}
```

#### FastAPI `HTTPException` 🆚 💃 `HTTPException`

**FastAPI** ✔️ 🚮 👍 `HTTPException`.

& **FastAPI**'Ⓜ `HTTPException` ❌ 🎓 😖 ⚪️➡️ 💃 `HTTPException` ❌ 🎓.

🕴 🔺, 👈 **FastAPI**'Ⓜ `HTTPException` ✔ 👆 🚮 🎚 🔌 📨.

👉 💪/⚙️ 🔘 ✳ 2️⃣.0️⃣ & 💂‍♂ 🚙.

, 👆 💪 🚧 🙋‍♀ **FastAPI**'Ⓜ `HTTPException` 🛎 👆 📟.

✋️ 🕐❔ 👆 ® ⚠ 🐕‍🦺, 👆 🔜 ® ⚫️ 💃 `HTTPException`.

from fastapi import Depends, FastAPI, HTTPException

app = FastAPI()


data = {
    "plumbus": {"description": "Freshly pickled plumbus", "owner": "Morty"},
    "portal-gun": {"description": "Gun to create portals", "owner": "Rick"},
}


class OwnerError(Exception):
    pass


def get_username():
    try:
        yield "Rick"
    except OwnerError as e: