bug: Unable to sign in with Discord

[shrekuu]

Provide environment information

npx envinfo --system --binaries

System:
OS: Linux 6.1 Debian GNU/Linux 12 (bookworm) 12 (bookworm)
CPU: (2) x64 AMD EPYC 7R32
Memory: 2.24 GB / 3.78 GB
Container: Yes
Shell: 5.9 - /usr/bin/zsh
Binaries:
Node: 20.14.0 - ~/.nvm/versions/node/v20.14.0/bin/node
npm: 10.7.0 - ~/.nvm/versions/node/v20.14.0/bin/npm
pnpm: 9.14.4 - ~/.nvm/versions/node/v20.14.0/bin/pnpm

ct3aMetadata.initVersion

7.38.1

Describe the bug

I

• followed the guide. Copied AUTH_DISCORD_ID AUTH_DISCORD_SECRET into .env file.
• Tried both sqlite and mysql db.
• Added NEXTAUTH_URL=https://try-t3-app.linwise.com/ in .env too.

It works when I run "pnpm dev", both on my local machine and on the debian server.

It does not work after I run "pnpm build" and use pm2 to start it like this:

next.js config, no standalone output way:
PORT=3006 pm2 start npm --name try-t3-app -- start

next.js config, standalone output way:
PORT=3006 pm2 start .next/standalone/server.js --name try-t3-app

I can open the page: https://try-t3-app.linwise.com/
Surprisingly, you see on the page it says "Logged in as", and "sign out".
I cleared all the cookies, and tried browser incognito mode. It still does not work.

When I go to https://try-t3-app.linwise.com/api/auth/signin, it says Server error.

This is the redirect url I have on discord oauth2 settings page:
https://try-t3-app.linwise.com/api/auth/callback/discord

Reproduction repo

https://github.com/shrekuu/try-t3-app

To reproduce

Just build the app and serve it locally. Update the AUTH_DISCORD_ID, AUTH_DISCORD_SECRET, DATABASE_URL in your local .env file.

You may need to add NEXTAUTH_URL="http://localhost:3000" too.

Make sure to use MySQL, if not, revert these changes and you are good to go.
shrekuu/try-t3-app@90e04df

Additional information

[shrekuu]

Figured it out.

Had to add AUTH_TRUST_HOST="try-t3-app.linwise.com" to .env file.

https://authjs.dev/getting-started/migrating-to-v5#environment-variables

So these two lines are necessary for discord to work properly.

NEXTAUTH_URL="https://try-t3-app.linwise.com"
AUTH_TRUST_HOST="try-t3-app.linwise.com"

Maybe we should add these two lines in .env when users create t3 app?

NEXTAUTH_URL="http://localhost"
AUTH_TRUST_HOST="localhost"