Any idea why `NEXT_PUBLIC_CONVEX_URL` is required in a vercel deployment of using convex auth?

[rough dove]

this caused many hours of investigation and confusion.

for some reason, upon deploying from vercel (preview & prod), NEXT_PUBLIC_CONVEX_URL was required ENV. there was an application server error due to it being missing. I assume triggered via convex-auth provider. During local development, this was never needed. My local .env did not include it.

I did have NEXT_PUBLIC_CONVEX_CLOUD_URL which what was used when initializing the client auth via const convex = new ConvexReactClient(process.env.NEXT_PUBLIC_CONVEX_CLOUD_URL!); however, no reference to NEXT_PUBLIC_CONVEX_URL within the project.

we added the ENV and things started working in preview deployments, then forgot about it. turns out having that random ENV set incorrectly in our Prod environments caused auth to not work in production. However, everything failed silently. Convex logs indicated 200 success responses from the user creation, but no user was ever created. after remembering that random ENV that was required, we went and fixed the typo and everything works now. frustrating, and dont need help solving that issue anymore... but i am very confused and looking for insight, there's no mention of that being required in the auth provider docs.

[unkempt mulch]

Thanks for posting in #1088161997662724167.
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[deft crystal]

Hey, that's a rough experience. The env var you're referencing is generally used for convex w/ next - it's in the instructions for adding auth to next, for example: https://docs.convex.dev/client/react/nextjs/#adding-authentication

Is it not referenced in your codebase?

[rough dove]

no it is not referenced in my codebase. i reference it as NEXT_PUBLIC_CONVEX_CLOUD_URL instead.

[deft crystal]

Convex logs indicated 200 success responses from the user creation, but no user was ever created.
Need to understand this part a bit better.

Can you share any relevant config code to help troubleshoot? Are you passing any props to <ConvexAuthNextjsServerProvider>?

[sinful meadow]

The auth provider defaults to that env variable name unless you override it, for a few things like the storageNamespace https://github.com/search?q=repo:get-convex/convex-auth NEXT_PUBLIC_CONVEX_URL&type=code

[deft crystal]

Yeah but that should be throwing errors, they're saying it fails silently

Here specifically https://github.com/get-convex/convex-auth/blob/10b4924e0b8e0a97d2130c01eaf02c8dd2b25fb6/src/nextjs/client.tsx#L59