## Eine Anwendung mit Callbacks { #an-app-with-callbacks }

Sehen wir uns das alles anhand eines Beispiels an.

Stellen Sie sich vor, Sie entwickeln eine Anwendung, mit der Sie Rechnungen erstellen können.

    ],
)
def get_client(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.additional_status_codes.{request.param}")

    client = TestClient(mod.app)
    return client


def test_update(client: TestClient):
    response = client.put("/items/foo", json={"name": "Wrestlers"})
    assert response.status_code == 200, response.text

В таких случаях вместо аннотации возвращаемого типа можно использовать параметр `response_model` у *декоратора операции пути*.

Параметр `response_model` можно указать у любой *операции пути*:

* `@app.get()`
* `@app.post()`
* `@app.put()`
* `@app.delete()`
* и т.д.

{* ../../docs_src/response_model/tutorial001_py310.py hl[17,22,24:27] *}

/// note | Примечание

ed {\n  color: #bdc6d0;\n  border-color: #bdc6d0;\n}\n\n.btn-app {\n  border-radius: 3px;\n  background-color: #f8f9fa;\n  border: 1px solid #ddd;\n  color: #6c757d;\n  font-size: 12px;\n  height: 60px;\n  margin: 0 0 10px 10px;\n  min-width: 80px;\n  padding: 15px 5px;\n  position: relative;\n  text-align: center;\n}\n\n.btn-app > .fa,\n.btn-app > .fas,\n.btn-app > .far,\n.btn-app > .fab,\n.btn-app > .fal,\n.btn-app > .fad,\n.btn-app > .svg-inline--fa,\n.btn-app > .ion {\n  display: block;\n  font-size:...

        pytest.param("tutorial008b_an_py39"),
    ],
)
def get_client(request: pytest.FixtureRequest):
    mod = importlib.import_module(f"docs_src.dependencies.{request.param}")

    client = TestClient(mod.app)
    return client


def test_get_no_item(client: TestClient):
    response = client.get("/items/foo")
    assert response.status_code == 404, response.text
    assert response.json() == {"detail": "Item not found"}

* [The golang-nuts mailing list](https://groups.google.com/d/forum/golang-nuts)

* [The Go Forum](https://forum.golangbridge.org/), a web-based forum

* [Gophers Slack](https://gophers.slack.com), use the [invite app](https://invite.slack.golangbridge.org/) for access

* [Stack Overflow](https://stackoverflow.com/questions/tagged/go) with questions tagged "go"

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.mapping;

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.mapping;

import org.lastaflute.web.ruts.multipart.MultipartFormFile;
import org.lastaflute.web.validation.Required;

/**
 * Form for uploading character mapping files to the Fess search engine.

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.synonym;

import org.lastaflute.web.validation.Required;
import org.lastaflute.web.validation.theme.conversion.ValidateTypeFailure;

/**

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package org.codelibs.fess.app.web.admin.dict.synonym;

import org.lastaflute.web.ruts.multipart.MultipartFormFile;
import org.lastaflute.web.validation.Required;

/**
 * Form for uploading synonym files to the Fess search engine.