The Nextjs next-auth implementation with URL '/api/auth/callback/cognito' encountered a 502 Bad Gateway error while in production

I'm facing a challenge while trying to deploy a nextjs app that utilizes 'next-auth' with AWS Cognito.

Interestingly, the app runs smoothly when tested locally using either next dev or next start.

However, upon deploying it on the production server (Ubuntu with Nginx), it encounters issues.

Here's the specific error: After accessing the Cognito built-in sign-in page, the redirect URL

https://...../api/auth/callback/cognito?code=......&state=.....
shows Nginx's default 502 error page.

My troubleshooting steps so far include:

  • Exploring every possible search result on Google, relevant GitHub issues, and Stack Overflow questions about this matter
  • Reviewing the error logs of both the production Next server and Nginx server, but finding no clues there
  • Checking the browser console logs, which also didn't provide any useful information

And yes, the Callback URL(s) setting for the app in AWS Cognito itself is correctly configured (

https:// ....... /api/auth/callback/cognito
).

Details:

CODE:

middleware.ts

export { default } from "next-auth/middleware";

export const config = { matcher: ["/dashboard/:path*"] };

next.config.js

/** @type {import('next').NextConfig} */
const nextConfig = {
  reactStrictMode: true,
  swcMinify: true,
  compiler: {
    styledComponents: true,
   
  },
};

module.exports = nextConfig;

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

import CognitoProvider from "next-auth/providers/cognito";
import NextAuth, { NextAuthOptions, Session } from "next-auth";
import {
  AuthFlowType,
  CognitoIdentityProviderClient,
  InitiateAuthCommand,
} from "@aws-sdk/client-cognito-identity-provider";
import { JWT } from "next-auth/jwt";

const COGNITO_AWS_REGION = process.env.COGNITO_AWS_REGION;
const COGNITO_POOL_ID = ...

Answer №1

After some investigation, I was able to resolve the issue on my own by carefully analyzing my nginx logs. Fortunately, it wasn't too difficult once I identified the problem. Here is the solution I implemented:

Key Solution:

The 502 error that was occurring seems to be related to an

upstream sent too big header while reading response header from upstream
error in the nginx error logs for that specific request. To fix this issue, simply add the following lines to your configuration file located at /etc/nginx/nginx.conf within the http {... } section ...

proxy_buffers 8 16k;
proxy_buffer_size 32k;

(I found this solution here: )

Additional Tips:

The steps above should address the 502 error, but if you're still encountering issues with next-auth, here are a few more tips that might help based on my troubleshooting experience...

In AWS Cognito, try creating and utilizing a new "App Client" without a client secret.

If you encounter errors like signin?error=OAuthCallback or

client_secret_basic client authentication method requires a client_secret
after making these changes, make sure to update the cognito config in pages/api/auth/[...nextauth].ts as follows...

CognitoProvider({
clientId: COGNITO_CLIENT_ID,
      issuer: `https://cognito-idp.${COGNITO_AWS_REGION}.amazonaws.com/${COGNITO_POOL_ID!}`,
      clientSecret: "someString",
      client: {
           token_endpoint_auth_method: "none",
      },
})

I came across this solution in a discussion thread here: https://github.com/nextauthjs/next-auth/issues/2524

Keep in mind that if you receive a redirect_mismatch error from Cognito, double-check your URLs in the AWS Cognito client app settings. This mistake often occurs when switching between local and live environments for debugging purposes.

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