04-请求体参数

from fastapi import FastAPI
from pydantic import BaseModel, Fieldapp = FastAPI()@app.get("/")
async def root():return {"message": "Hello World"}# 注册： 用户名和密码 → str
class User(BaseModel):username: str = Field(default="张三", min_length=2, max_length=10, description="用户名，长度要求2-10个字")password: str = Field(min_length=3, max_length=20)@app.post("/register")
async def register(user: User):return user