@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Или используйте <code>async def</code>...</summary>

Если ваш код использует `async` / `await`, используйте `async def`:

```Python hl_lines="9  14"
from typing import Union

from fastapi import FastAPI

app = FastAPI()

            "type": "extra_forbidden",
            "loc": ["query", "tool"],
            "msg": "Extra inputs are not permitted",
            "input": "plumbus"
        }
    ]
}
```

## Resumo { #summary }

Você pode utilizar **modelos Pydantic** para declarar **parâmetros de consulta** no **FastAPI**. 😎

/// tip | Dica

            "openapi": "3.1.0",
            "info": {"title": "Minimal FastAPI App", "version": "1.0.0"},
            "paths": {
                "/messages": {
                    "post": {
                        "summary": "Create Message",
                        "operationId": "create_message_messages_post",
                        "parameters": [
                            {
                                "name": "input_message",

        {
            "openapi": "3.1.0",
            "info": {"title": "FastAPI", "version": "0.1.0"},
            "paths": {
                "/items/": {
                    "get": {
                        "summary": "Read Items",
                        "operationId": "read_items_items__get",
                        "parameters": [
                            {
                                "name": "session_id",

                                },
                                "description": "Validation Error",
                            },
                        },
                        "summary": "Get Facility",
                    }
                }
            },
        }

    return {"Hello": "World"}


@app.get("/items/{item_id}")
def read_item(item_id: int, q: str = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>または<code>async def</code>を使います...</summary>

`async` / `await`を使用するときは、 `async def`を使います:

```Python hl_lines="7 12"
from fastapi import FastAPI

app = FastAPI()


@app.get("/")
async def read_root():

@app.get("/items/{item_id}")
def read_item(item_id: int, q: Union[str, None] = None):
    return {"item_id": item_id, "q": q}
```

<details markdown="1">
<summary>Or use <code>async def</code>...</summary>

If your code uses `async` / `await`, use `async def`:

```Python hl_lines="9  14"
from typing import Union

from fastapi import FastAPI

app = FastAPI()

            "loc": ["cookie", "santa_tracker"],
            "msg": "Extra inputs are not permitted",
            "input": "good-list-please",
        }
    ]
}
```

## Resumen { #summary }

                                    }
                                }
                            },
                        },
                    },
                    "summary": "Save Item No Body",
                    "operationId": "save_item_no_body_items__post",
                    "requestBody": {
                        "content": {
                            "application/json": {

                                    }
                                }
                            },
                        },
                    },
                    "summary": "Update Item",
                    "operationId": "update_item_items__item_id__put",
                    "parameters": [
                        {
                            "required": True,