How to add callbackUrl for signin/signout for preview deployments?

[jcheese1]

Please refer to the documentation, the example project and existing issues before creating a new issue.

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I guess this is more on how to obtain the baseUrl in Next.js, but searched around to no avail. How can I setup an absolute url in the frontend for callbackUrl in preview deployments? Is it possible?

Thanks

What are you trying to do
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Trying to setup a callbackUrl in preview deployments

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[camsloanftc]

I think if you're deploying to Vercel, you're probably going to need something like VERCEL_URL from this list of system environment variables:

https://vercel.com/docs/v2/build-step#system-environment-variables

I actually haven't deployed anything this way yet, so I could be wrong, but that's where I would start.