すべてのapiでCORSが有効になります。POSTメソッドを使う場合は、OPTIONSも追加必要かもです
vercel.json
{
"headers": [
{
"source": "/(.*)",
"headers": [
{ "key": "Access-Control-Allow-Origin", "value": "*" },
{ "key": "Access-Control-Allow-Methods", "value": "*" },
{ "key": "Access-Control-Allow-Headers", "value": "*" }
]
}
]
}
hello.js
export async function POST(request) {
return new Response()
}
export async function OPTIONS() {
return new Response()
}