with pytest.raises(RuntimeError, match=multipart_incorrect_install_error):
        app = FastAPI()

        @app.post("/")
        async def root(username: str = Form(), password: str = Form()):
            return username  # pragma: nocover


def test_incorrect_multipart_installed_form_file(monkeypatch):
    monkeypatch.setattr("python_multipart.__version__", "0.0.12")

Por exemplo, em uma das maneiras que a especificação OAuth2 pode ser usada (chamada "fluxo de senha"), é necessário enviar um `username` e uma `password` como campos do formulário.

A <abbr title="specification – especificação">spec</abbr> exige que os campos sejam exatamente nomeados como `username` e `password` e sejam enviados como campos de formulário, não JSON.

      if (callback is PasswordCallback) {
        val console = System.console()

        if (console != null) {
          callback.password = console.readPassword(callback.prompt)
        } else {
          System.err.println(callback.prompt)
          callback.password =
            System.`in`
              .bufferedReader()
              .readLine()
              .toCharArray()
        }
      } else {

            String username = System.getenv("MVNW_USERNAME");
            char[] password = System.getenv("MVNW_PASSWORD").toCharArray();
            Authenticator.setDefault(new Authenticator() {
                @Override
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication(username, password);
                }
            });
        }

from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str


@app.post("/login/")
async def login(data: FormData = Form()):

  }

  @Test
  fun decodePassword() {
    assertThat(parse("http://user:password@host/").password).isEqualTo("password")
    assertThat(parse("http://user:@host/").password).isEqualTo("")
    assertThat(parse("http://user:%F0%9F%8D%A9@host/").password)
      .isEqualTo("\uD83C\uDF69")
  }

  @Test
  fun decodeSlashCharacterInDecodedPathSegment() {

## 定义 `Form` 参数

创建表单（`Form`）参数的方式与 `Body` 和 `Query` 一样：

{* ../../docs_src/request_forms/tutorial001.py hl[7] *}

例如，OAuth2 规范的 "密码流" 模式规定要通过表单字段发送 `username` 和 `password`。

<abbr title="specification">该规范</abbr>要求字段必须命名为 `username` 和 `password`，并通过表单字段发送，不能用 JSON。

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

            throws PrompterException;

    /**
     * Prompts the user for a password.
     *
     * @param message the message to display
     * @return the password entered by the user
     * @throws PrompterException if an exception occurs
     */
    @Nonnull
    String promptForPassword(@Nullable String message) throws PrompterException;

from typing import Annotated

from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str


@app.post("/login/")
async def login(data: Annotated[FormData, Form()]):

	Table              string   `json:"table"`
	Host               xnet.URL `json:"host"`
	Port               string   `json:"port"`
	User               string   `json:"user"`
	Password           string   `json:"password"`
	Database           string   `json:"database"`
	QueueDir           string   `json:"queueDir"`
	QueueLimit         uint64   `json:"queueLimit"`
	MaxOpenConnections int      `json:"maxOpenConnections"`
}