///

```Python hl_lines="11-14"
{!> ../../docs_src/body_fields/tutorial001.py!}
```

////

`Field` 的工作方式和 `Query`、`Path`、`Body` 相同，参数也相同。

/// note | "技术细节"

实际上，`Query`、`Path` 都是 `Params` 的子类，而 `Params` 类又是 Pydantic 中 `FieldInfo` 的子类。

Pydantic 的 `Field` 返回也是 `FieldInfo` 的类实例。

`Body` 直接返回的也是 `FieldInfo` 的子类的对象。后文还会介绍一些 `Body` 的子类。

注意，从 `fastapi` 导入的 `Query`、`Path` 等对象实际上都是返回特殊类的函数。

///

    data = response.json()
    assert response.status_code == 200
    assert data == {"name": "invalid", "price": 3.2, "owner_ids": None}


def test_valid_none_none():
    response = client.get("/items/validnone", params={"send_none": "true"})
    data = response.json()
    assert response.status_code == 200
    assert data is None


def test_double_invalid():
    with pytest.raises(ResponseValidationError):

     *
     * @see org.codelibs.fess.crawler.extractor.Extractor#getText(java.io.InputStream,
     * java.util.Map)
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        if (in == null) {
            throw new CrawlerSystemException("The inputstream is null.");
        }
        try {
            @SuppressWarnings("resource")

                    return false;
                }
            }
            cur = cur.getNext();
        }
        return true;
    }


    /**
     * @param request
     * @param response
     * @param params
     * @throws IOException
     * @throws SmbException
     * @throws TransportException
     * @throws EOFException
     */

            throw new IORuntimeException(e);
        }
    }

    protected HttpEntity parseRequestParameters(final String params, final List<Pair<String, String>> paramList, final String encoding) {
        try {
            final List<BasicNameValuePair> parameters =
                    StreamUtil.split(params, "&").get(stream -> stream.filter(StringUtil::isNotBlank).map(s -> {
                        final String name;

            }
            saveInfo(messages -> messages.addSuccessUploadKuromojiFile(GLOBAL));
            return redirectWith(getClass(), moreUrl("list/1").params("dictId", form.dictId));
        }).orElseGet(() -> {
            throwValidationError(messages -> messages.addErrorsFailedToUploadKuromojiFile(GLOBAL), () -> uploadpage(form.dictId));
            return null;
        });

     * @see
     * org.codelibs.fess.crawler.extractor.impl.Extractor#getText(java.io.InputStream,
     * java.util.Map)
     */
    @Override
    public ExtractData getText(final InputStream in, final Map<String, String> params) {
        if (in == null) {
            throw new CrawlerSystemException("The inputstream is null.");
        }
        try {
            @SuppressWarnings("resource")

            }
            saveInfo(messages -> messages.addSuccessUploadStemmeroverrideFile(GLOBAL));
            return redirectWith(getClass(), moreUrl("list/1").params("dictId", form.dictId));
        }).orElseGet(() -> {
            throwValidationError(messages -> messages.addErrorsFailedToUploadStemmeroverrideFile(GLOBAL), () -> uploadpage(form.dictId));
            return null;

@app.get("/int/{param:int}")
def int_convertor(param: int = Path()):
    return {"int": param}


@app.get("/float/{param:float}")
def float_convertor(param: float = Path()):
    return {"float": param}


@app.get("/path/{param:path}")
def path_convertor(param: str = Path()):
    return {"path": param}


@app.get("/query/")
def query_convertor(param: str = Query()):
    return {"query": param}

    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Here's your interdimensional portal."}


def test_get_redirect():
    response = client.get("/portal", params={"teleport": True}, follow_redirects=False)
    assert response.status_code == 307, response.text
    assert response.headers["location"] == "https://www.youtube.com/watch?v=dQw4w9WgXcQ"


def test_openapi_schema():