{
                "input": None,
                "loc": [
                    "body",
                    "item",
                ],
                "msg": "Field required",
                "type": "missing",
            },
            {
                "input": None,
                "loc": [
                    "body",
                    "user",
                ],
                "msg": "Field required",

    assert response.json() == {
        "detail": [
            {
                "loc": ["body", "name"],
                "input": {},
                "msg": "Field required",
                "type": "missing",
            },
            {
                "loc": ["body", "price"],
                "input": {},
                "msg": "Field required",
                "type": "missing",
            },

    }

    /**
     * Creates a temporary file containing the response body from the given ResponseData.
     *
     * @param responseData the response data containing the response body
     * @return a temporary file containing the response body
     * @throws CrawlingAccessException if an error occurs while reading the response body
     */
    public static File createResponseBodyFile(final ResponseData responseData) {

/// warning | Achtung

Sie können mehrere `File`- und `Form`-Parameter in einer *Pfadoperation* deklarieren, aber Sie können nicht auch `Body`-Felder deklarieren, die Sie als JSON erwarten, da der Body des <abbr title="Request – Anfrage: Daten, die der Client zum Server sendet">Request</abbr> mittels `multipart/form-data` statt `application/json` kodiert sein wird.

    """
    Get a ModelField representing the request body for a path operation, combining
    all body parameters into a single field if necessary.

    Used to check if it's form data (with `isinstance(body_field, params.Form)`)
    or JSON and to generate the JSON Schema for a request body.

    This is **not** used to validate/parse the request body, that's done with each
    individual body parameter.
    """

    /**
     * Retrieves failure URL logs with pagination.
     *
     * @param body the search criteria
     * @return JSON response containing the failure URL logs
     */
    @Execute
    public JsonResponse<ApiResult> logs(final SearchBody body) {
        validateApi(body, messages -> {});
        final FailureUrlPager pager = copyBeanToNewBean(body, FailureUrlPager.class);

/// info | Info

`Form` ist eine Klasse, die direkt von `Body` erbt.

///

/// tip | Tipp

Um Formularbodys zu deklarieren, verwenden Sie explizit `Form`, da diese Parameter sonst als Query-Parameter oder Body (JSON)-Parameter interpretiert werden würden.

///

      return
    }

    val body = response.body ?: return
    socket.sleepWhileOpen(response.bodyDelayNanos)
    val responseBodySink =
      socket.sink
        .withThrottlingAndSocketEffect(
          policy = response,
          socketEffect = response.onResponseBody,
          expectedByteCount = body.contentLength,
          socket = socket,
        ).buffer()
    body.writeTo(responseBodySink)

    // Fourth QUERY request with body "foo" again, should be cached and return "ABC"
    val response1a = client.newCall(request1).execute()
    assertThat(response1a.body.string()).isEqualTo("ABC")

    // Fifth QUERY request with body "bar" again, should be cached and return "DEF"
    val response2a = client.newCall(request2).execute()
    assertThat(response2a.body.string()).isEqualTo("DEF")

from typing import Union

from fastapi import Body, FastAPI, status
from fastapi.responses import JSONResponse

app = FastAPI()

items = {"foo": {"name": "Fighters", "size": 6}, "bar": {"name": "Tenders", "size": 3}}


@app.put("/items/{item_id}")
async def upsert_item(
    item_id: str,
    name: Union[str, None] = Body(default=None),
    size: Union[int, None] = Body(default=None),
):
    if item_id in items: