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## Resultate

Mit nur dieser Python-Typdeklaration, wird **FastAPI**:

* Den Requestbody als JSON lesen.
* Die entsprechenden Typen konvertieren (falls nötig).
* Diese Daten validieren.
    * Wenn die Daten ungültig sind, einen klar lesbaren Fehler zurückgeben, der anzeigt, wo und was die inkorrekten Daten waren.
* Ihnen die erhaltenen Daten im Parameter `item` übergeben.

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *

                    "ctx": {"limit_value": 0},
                    "loc": ["body", "item", "price"],
                    "msg": "ensure this value is greater than 0",
                    "type": "value_error.number.not_gt",
                }
            ]
        }
    )


def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text

                    "ctx": {"limit_value": 0},
                    "loc": ["body", "item", "price"],
                    "msg": "ensure this value is greater than 0",
                    "type": "value_error.number.not_gt",
                }
            ]
        }
    )


@needs_py39
def test_openapi_schema(client: TestClient):
    response = client.get("/openapi.json")
    assert response.status_code == 200, response.text

```JSON
{
    "message": "Hello World",
    "root_path": "/api/v1"
}
```

/// tip

Notice that even though you are accessing it at `http://127.0.0.1:8000/app` it shows the `root_path` of `/api/v1`, taken from the option `--root-path`.

///

read_users["/users/"]

common_parameters --> read_items
common_parameters --> read_users
```

This way you write shared code once and **FastAPI** takes care of calling it for your *path operations*.

/// check

Notice that you don't have to create a special class and pass it somewhere to **FastAPI** to "register" it or anything similar.

You just pass it to `Depends` and **FastAPI** knows how to do the rest.

///