getSession in API takes 5-10 seconds in a new project

[davudk]

Question 💬

The title says it all..

I am trying to use getSession({ req }) on the server side and it's taking way too long.

Why is it taking so long? I didn't flag it as bug since I might have overlooked something.

Other info

I've hit this test API on the client side (latest Chrome and Safari) using axios and also using Postman (no cookies were passed).

The result is that it regularly takes 4-8 seconds to complete.

This delay is only present when deployed onto Vercel. When running locally (using vercel dev) there is no delay and everything is alright.

For reference, here is the test API on my sample deployment (hit this in Postman with a GET request):
https://gbs-website-aybet3xkf-eagle-logistics.vercel.app/api/test

Image for reference:

The session in the response is expectedly null.

Version: 3.29.0

How to reproduce ☕️

Here are the relevant files:

pages/api/auth/[...nextauth].ts

import NextAuth, { NextAuthOptions } from 'next-auth';
import Providers from 'next-auth/providers';

const authOptions: NextAuthOptions = {
    providers: [
        Providers.Credentials({
            credentials: {
                username: { label: "Username", type: "text", placeholder: "jsmith" },
                password: { label: "Password", type: "password" }
            },
            async authorize(credentials, req) {
                return null;
            }
        }),
    ]
};

export default NextAuth(authOptions);

pages/api/test.ts

import type { NextApiRequest, NextApiResponse } from 'next';
import { getSession } from 'next-auth/client';

export default async (req: NextApiRequest, res: NextApiResponse) => {
    console.log('session load start:', new Date().toISOString());
    const session = await getSession({ req });
    console.log('session load end:', new Date().toISOString());

    res.status(200).json({ session });
}

[balazsorban44]

Duplicate of #1535