使用 `Form` 可以声明与 `Body` （及 `Query`、`Path`、`Cookie`）相同的元数据和验证。

/// info | 说明

`Form` 是直接继承自 `Body` 的类。

///

/// tip | 提示

声明表单体要显式使用 `Form` ，否则，FastAPI 会把该参数当作查询参数或请求体（JSON）参数。

///

## 关于 "表单字段"

与 JSON 不同，HTML 表单（`<form></form>`）向服务器发送数据通常使用「特殊」的编码。

**FastAPI** 要确保从正确的位置读取数据，而不是读取 JSON。

/// note | 技术细节

    assert response.status_code == 200, response.text
    assert response.json() == {"message": "Hello, World!"}


def test_get_root_no_token():
    response = client.get("/")
    assert response.status_code == 401, response.text
    assert response.json() == {"detail": "Not authenticated"}


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

* Documentación automática de modelos de datos con <a href="https://json-schema.org/" class="external-link" target="_blank"><strong>JSON Schema</strong></a> (ya que OpenAPI en sí mismo está basado en JSON Schema).
* Diseñado alrededor de estos estándares, tras un estudio meticuloso. En lugar de ser una capa adicional.

    assert response.json() == {"username": "secret"}


def test_security_api_key_no_key():
    response = client.get("/users/me")
    assert response.status_code == 401, response.text
    assert response.json() == {"detail": "Not authenticated"}
    assert response.headers["WWW-Authenticate"] == "APIKey"


def test_openapi_schema():
    response = client.get("/openapi.json")

    assert response.json() == {"username": "secret"}


def test_security_api_key_no_key():
    response = client.get("/users/me")
    assert response.status_code == 401, response.text
    assert response.json() == {"detail": "Not authenticated"}
    assert response.headers["WWW-Authenticate"] == "APIKey"


def test_openapi_schema():
    response = client.get("/openapi.json")

    assert response.status_code == 200, response.text
    assert response.json() == {
        "description": "All my friends drive a low rider",
        "type": "car",
    }


def test_get_plane(client: TestClient):
    response = client.get("/items/item2")
    assert response.status_code == 200, response.text
    assert response.json() == {
        "description": "Music is my aeroplane, it's my aeroplane",

    assert response.status_code == 401, response.text
    assert response.json() == {"detail": "Not authenticated"}
    assert response.headers["WWW-Authenticate"] == "Bearer"


def test_token(client: TestClient):
    response = client.get("/users/me", headers={"Authorization": "Bearer testtoken"})
    assert response.status_code == 200, response.text
    assert response.json() == {
        "username": "testtokenfakedecoded",

// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package json

import (
	"encoding/xml"
	"fmt"
	"strings"
)

const (
	document = "document"
	lines    = "lines"

	defaultRecordDelimiter = "\n"
)

// ReaderArgs - represents elements inside <InputSerialization><JSON/> in request XML.
type ReaderArgs struct {
	ContentType string `xml:"Type"`
	unmarshaled bool
}

Y podrías hacer esto incluso si el tipo de datos en el request no es JSON.

Por ejemplo, en esta aplicación no usamos la funcionalidad integrada de FastAPI para extraer el JSON Schema de los modelos Pydantic ni la validación automática para JSON. De hecho, estamos declarando el tipo de contenido del request como YAML, no JSON:

//// tab | Pydantic v2

E você pode fazer isso até mesmo quando os dados da requisição não seguem o formato JSON.