第一步点击 
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第二步申请填写信息 
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第三步执行后端程序验证 
minimal_oauth_app.py 
from fastapi import FastAPI, Request, Depends, HTTPException, status
from fastapi.responses import RedirectResponse, JSONResponse
from fastapi.security import OAuth2AuthorizationCodeBearer
import os
import secrets
import requests
from starlette.middleware.sessions import SessionMiddleware

app = FastAPI()
app.add_middleware(S...