Configuration examples
FastAPI
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
app = FastAPI()
app.add_middleware(
CORSMiddleware,
allow_origins=["https://app.example.com"],
allow_credentials=True,
allow_methods=["*"],
allow_headers=["*"],
)Express
import express from 'express';
import cors from 'cors';
const app = express();
app.use(cors({
origin: 'https://app.example.com',
credentials: true,
methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
}));Important
Do not combine allow_origins=['*'] with
allow_credentials=true.