Wildcard subdomains in preview URLs?

[lardissone]

Is there a way to use wildcard subdomains on preview URLs?

We need our dev team to add comments to our PRs before we merge to staging branch.
So that they should be able to see the site working somewhere to do the corresponding QA.
The problem is that our current multi-tenant app uses subdomain to know which tenant is working on, but preview URLs generated on PRs seems to not allow subdomains.

I know that probably a solution would be use a new branch for testing, but since Vercel offers this awesome feature it would be easier and our development would be faster too because we can test several things in parallel.

[paulogdm]

Perhaps you are looking for the "preview deployment suffix" add-on, which replaces "vercel.app" with an arbitrary domain for development purposes? If so, you can enable it on your billing page.

[gregonarash]

I think this issue is still no resolved

docs for https://github.com/vercel/platforms suggest that:

you can use wildcard subdomains on .vercel.app links that are associated with your Vercel team slug

Testing however it does not seem that you can deploy Platforms on platforms-myfork.vercel.app and expect the *.platforms-myfork.vercel.app to work. Running into issues with SSL.

[claudiowilson]

@gregonarash I can confirm that I am also seeing this issue

[amyegan]

It should work if you add the *.<user|team>.vercel.app wildcard domain to your project settings. Note that this only works with your user name for hobby accounts or team name for teams (middleware.ts#L33). It won't work with the generated URL because of SSL cert issues, as you saw.

[StanBoyet]

@amyegan So this does not answer the issue raised in the first place where you have a multi-tenants app and you'd like to have {tenant-name}.pr-number-branch.my-saas.com, where tenant-name can be whatever you want and pr-number-branch the unique identifier of a preview app itself.

Correct? Or am I missing something?

[amyegan]

Yes and no 😅 Remember that you could only ever use wildcard subdomains on the *.vercel.app domain associated with your Vercel team slug or on your own custom domain.

You could assign *.<user|team slug>.vercel.app to a preview branch if the goal is to have a wildcard preview environment, but then you would need to add a new custom domain for production deployments. However you cannot add wildcards to deployment-specific URLs or Git branch URLs, so you wouldn't be able to have a unique address for each branch or deployment.