## Do not Separate Schemas { #do-not-separate-schemas }

Now, there are some cases where you might want to have the **same schema for input and output**.

    \f
    Text after form feed character.
    """


@app.get("/foo")
def foo(v: MyModel):  # pragma: no cover
    pass


client = TestClient(app)


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

Dann würde es hinter den Kulissen diese JSON-kompatiblen Daten (z. B. ein `dict`) in eine `JSONResponse` einfügen, die zum Senden der <abbr title="Response – Antwort: Daten, die der Server zum anfragenden Client zurücksendet">Response</abbr> an den Client verwendet wird.

Sie können jedoch direkt eine `JSONResponse` von Ihren *Pfadoperationen* zurückgeben.

Das kann beispielsweise nützlich sein, um benutzerdefinierte Header oder Cookies zurückzugeben.

                    },
                },
                "summary": "A",
                "operationId": "a_a_get",
            }
        }
    },
}

client = TestClient(app)


def test_openapi_schema():
    with pytest.raises(ValueError):

    assert settings.items_per_user == 50


def test_endpoint(main_mod: ModuleType, monkeypatch: MonkeyPatch):
    monkeypatch.setenv("ADMIN_EMAIL", "******@****.***")
    client = TestClient(main_mod.app)
    response = client.get("/info")
    assert response.status_code == 200
    assert response.json() == {
        "app_name": "Awesome API",
        "admin_email": "******@****.***",
        "items_per_user": 50,

Hier ist eine visuelle Darstellung, wie der **Proxy** weitergeleitete Header zwischen dem Client und dem **Anwendungsserver** hinzufügt:

```mermaid
sequenceDiagram
    participant Client
    participant Proxy as Proxy/Loadbalancer
    participant Server as FastAPI Server

    Client->>Proxy: HTTPS-Request<br/>Host: mysuperapp.com<br/>Pfad: /items

    Note over Proxy: Proxy fügt Forwarded-Header hinzu

// SealETag seals the etag using the object key.
// It does not encrypt empty ETags because such ETags indicate
// that the S3 client hasn't sent an ETag = MD5(object) and
// the backend can pick an ETag value.
func (key ObjectKey) SealETag(etag []byte) []byte {
	if len(etag) == 0 { // don't encrypt empty ETag - only if client sent ETag = MD5(object)
		return etag
	}
	var buffer bytes.Buffer
	mac := hmac.New(sha256.New, key[:])

const crossDomainXMLEntity = "/crossdomain.xml"

// A cross-domain policy file is an XML document that grants a web client, such as Adobe Flash Player
// or Adobe Acrobat (though not necessarily limited to these), permission to handle data across domains.
// When clients request content hosted on a particular source domain and that content make requests

    def create_person(person: PersonCreate) -> Any:
        db_person = Person.model_validate(person)
        return db_person

    client = TestClient(app)

    person_data = {"name": "Dive", "lastname": "Wilson"}
    response = client.post("/people/", json=person_data)
    data = response.json()
    assert response.status_code == 200, response.text
    assert data["name"] == person_data["name"]

    # Before the lifespan starts, "items" is still empty
    assert items == {}

    with TestClient(app) as client:
        # Inside the "with TestClient" block, the lifespan starts and items added
        assert items == {"foo": {"name": "Fighters"}, "bar": {"name": "Tenders"}}

        response = client.get("/items/foo")
        assert response.status_code == 200
        assert response.json() == {"name": "Fighters"}