FastAPI 跨域问题

使用FastAPI开发接口时，跨域调用报错如下：

Access to XMLHttpRequest at 'http://127.0.0.1:8000/API/ADMIN/ADDUSER' from origin 'null' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.

解决办法：

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware


app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],#允许进行跨域请求的来源列表，*作为通配符
    allow_credentials=True,#跨域请求支持cookie，默认为否
    allow_methods=["*"],#允许跨域请求的HTTP方法
    allow_headers=["*"],#允许跨域请求的HTTP头列表
)

FastAPI原文介绍：https://fastapi.tiangolo.com/tutorial/cors/