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

创建表单参数的方式与 `Body` 或 `Query` 相同：

{* ../../docs_src/request_forms/tutorial001_an_py310.py hl[9] *}

例如，在 OAuth2 规范的一种使用方式（称为“密码流”）中，要求将 `username` 和 `password` 作为表单字段发送。

<dfn title="规范">规范</dfn>要求这些字段必须精确命名为 `username` 和 `password`，并且作为表单字段发送，而不是 JSON。

使用 `Form` 可以像使用 `Body`（以及 `Query`、`Path`、`Cookie`）一样声明相同的配置，包括校验、示例、别名（例如将 `username` 写成 `user-name`）等。

/// info

`Form` 是直接继承自 `Body` 的类。

///

from typing import Annotated

from fastapi import FastAPI, Form

app = FastAPI()


@app.post("/login/")
async def login(username: Annotated[str, Form()], password: Annotated[str, Form()]):

        shareInfo502.permissions = 2;
        shareInfo502.max_uses = 10;
        shareInfo502.current_uses = 5;
        shareInfo502.path = "C:\\test";
        shareInfo502.password = "password";
        shareInfo502.sd_size = 2;
        shareInfo502.security_descriptor = new byte[] { 1, 2 };

        // Set up mocks for the security descriptor encoding

            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);
                }
            });
        }

      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 {

      with:
        path: ~/go/pkg/mod
        key: ${{ runner.os }}-go-${{ matrix.go }}-${{ hashFiles('tests/go.mod') }}

    - name: Tests
      run: GITHUB_ACTION=true GORM_DIALECT=postgres GORM_DSN="user=gorm password=gorm dbname=gorm host=localhost port=9920 sslmode=disable TimeZone=Asia/Shanghai" ./tests/tests_all.sh

  sqlserver:
    strategy:
      matrix:
        go: ['stable', 'oldstable']

from fastapi import FastAPI, Form
from pydantic import BaseModel

app = FastAPI()


class FormData(BaseModel):
    username: str
    password: str
    model_config = {"extra": "forbid"}


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

     *            domain for NTLM fallback
     * @param username
     *            user for NTLM fallback
     * @param password
     *            password for NTLM fallback
     */
    public Kerb5Authenticator(Subject subject, String domain, String username, String password) {
        super(domain, username, password);
        this.canFallback = true;
        this.subject = subject;
    }

    /**

			lookupRes, groupDistNames, err := globalIAMSys.LDAPConfig.Bind(username, password)
			if err != nil {
				return false, err
			}
			ldapPolicies, _ := globalIAMSys.PolicyDBGet(lookupRes.NormDN, groupDistNames...)
			return len(ldapPolicies) > 0, nil
		}
		return subtle.ConstantTimeCompare([]byte(sa.Credentials.SecretKey), []byte(password)) == 1, nil
	}

	ui, ok := globalIAMSys.GetUser(context.Background(), username)