下一章介绍详细内容。

## 顺序很重要

有时，*路径操作*中的路径是写死的。

比如要使用 `/users/me` 获取当前用户的数据。

然后还要使用 `/users/{user_id}`，通过用户 ID 获取指定用户的数据。

由于*路径操作*是按顺序依次运行的，因此，一定要在 `/users/{user_id}` 之前声明 `/users/me` ：

{* ../../docs_src/path_params/tutorial003.py hl[6,11] *}

否则，`/users/{user_id}` 将匹配 `/users/me`，FastAPI 会**认为**正在接收值为 `"me"` 的 `user_id` 参数。

## 预设值

路径操作使用 Python 的 <abbr title="Enumeration">`Enum`</abbr> 类型接收预设的*路径参数*。

E então você também pode ter um path `/users/{user_id}` para obter dados sobre um usuário específico por algum ID de usuário.

Como as *operações de rota* são avaliadas em ordem, você precisa garantir que o path para `/users/me` seja declarado antes do de `/users/{user_id}`:

{* ../../docs_src/path_params/tutorial003_py39.py hl[6,11] *}

class Item(BaseModel):
    name: str
    price: float


class ResponseMessage(BaseModel):
    message: str


class User(BaseModel):
    username: str
    email: str


@app.post("/items/", response_model=ResponseMessage, tags=["items"])
async def create_item(item: Item):
    return {"message": "Item received"}

{
    "properties": {
      "hostname": {
        "type": "keyword"
      },
      "port": {
        "type": "integer"
      },
      "protocolScheme": {
        "type": "keyword"
      },
      "username": {
        "type": "keyword"
      },
      "password": {
        "type": "keyword"
      },
      "parameters": {
        "type": "keyword"
      },
      "fileConfigId": {
        "type": "keyword"
      },

package cmd

import (
	"context"
	"strings"

	"github.com/minio/madmin-go/v3"
	"github.com/minio/minio/internal/auth"
)

// getUserWithProvider - returns the appropriate internal username based on the user provider.
// if validate is true, an error is returned if the user does not exist.
func getUserWithProvider(ctx context.Context, userProvider, user string, validate bool) (string, error) {
	switch userProvider {

    assertThat(parse("http://username:@host/path"))
      .isEqualTo(parse("http://username@host/path"))
  }

  @Test
  fun passwordWithEmptyUsername() {
    // Chrome doesn't mind, but Firefox rejects URLs with empty usernames and non-empty passwords.
    assertThat(parse("http://:@host/path"))
      .isEqualTo(parse("http://host/path"))
    assertThat(parse("http://:password@@host/path").encodedPassword)

      },
      "port": {
        "type": "integer"
      },
      "authRealm": {
        "type": "keyword"
      },
      "protocolScheme": {
        "type": "keyword"
      },
      "username": {
        "type": "keyword"
      },
      "password": {
        "type": "keyword"
      },
      "parameters": {
        "type": "keyword"
      },
      "webConfigId": {
        "type": "keyword"

                                        <th><la:message
                                                key="labels.webauth_username"/></th>
                                        <td>${f:h(username)}<la:hidden property="username"/></td>
                                    </tr>
                                    <tr>
                                        <th><la:message

from fastapi import FastAPI
from pydantic import BaseModel, EmailStr

app = FastAPI()


class BaseUser(BaseModel):
    username: str
    email: EmailStr
    full_name: str | None = None


class UserIn(BaseUser):
    password: str


@app.post("/user/")
async def create_user(user: UserIn) -> BaseUser:

from fastapi import FastAPI
from pydantic import BaseModel, EmailStr

app = FastAPI()


class UserIn(BaseModel):
    username: str
    password: str
    email: EmailStr
    full_name: str | None = None


# Don't do this in production!
@app.post("/user/")
async def create_user(user: UserIn) -> UserIn: