personal-site/vercel.json

{
    "headers": [
        {
            "source": "/api/(.*)",
            "headers": [
                { "key": "Access-Control-Allow-Credentials", "value": "true" },
                { "key": "Access-Control-Allow-Origin", "value": "*" },
                { "key": "Access-Control-Allow-Methods", "value": "GET,OPTIONS,PATCH,DELETE,POST,PUT" },
                { "key": "Access-Control-Allow-Headers", "value": "X-CSRF-Token, X-Requested-With, Accept, Accept-Version, Content-Length, Content-MD5, Content-Type, Date, X-Api-Version" }
            ]
        }
    ],
    "rewrites": [
        {
            "source": "/api/:path*",
            "destination": "/api/:path*",
            "headers": [
                { "key": "Access-Control-Allow-Origin", "value": "*" },
                { "key": "Access-Control-Allow-Methods", "value": "GET,OPTIONS" },
                { "key": "Access-Control-Allow-Headers", "value": "X-Requested-With,content-type" }
            ]
        }
    ]
}