Custom Domain not working for www subdomains

[geret1]

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• [X] I give permission for members of the FlutterFlow team to access and test my project for the sole purpose of investigating this issue.

Current Behavior

When user with a custom domain try to access www.mydomain.com redirects to mydomain.com instead of keep in www

Expected Behavior

Keep www subdomain.

Steps to Reproduce

1. Create a custom domain with www support
2. Configure DNS records as suggested in FF (even proxy CNAME configuration that is not explained in the docs).
3. Try

Reproducible from Blank

• [ ] The steps to reproduce above start from a blank project.

Bug Report Code (Required)

IT4kz/Ll8ZNIvulA187pbfowtDg7Q1g/TL07ttYbZxUjIuPtBJh/f8/BP01oQvW7dENhHFGLjToH0MLRkvDhDvA6aDeZR4B51od2TwvNTXq8Sq64ELuafHEkJJpWGhGZ1qaJ3xJ/AO5qLkYM12CQIOjIEzfcGZ+/Zwh9f6PHaOI=

Visual documentation

Environment

- FlutterFlow version: FlutterFlow v5.0.10+ released November 15, 2024
- Flutter version is 3.24.2
- Platform: Web
- Browser name and version: Chrome (latest)
- Operating system and version affected: OS X

Additional Information

Documentation and UI is very poor here explaining actually nothing so users cannot help on that task.

[Alezanello]

Hello!

You can set up the custom domain directly with the www subdomain. This means the A record in your DNS settings would be www..com, and you won’t need to configure a CNAME record.

However, please note that even with this setup, the browser might display the domain without the www prefix until you double-click on it. I’ll share a GIF below to demonstrate this behavior.

Best regards,
Azanello

[geret1]

Unfortunately developer tools are saying a different thing (screenshot attached).

An initial request is made to www subdomain then, a 301 response code redirects to the A record. FF seems configured properly considering www subdomain (screenshot attached)

However, I don't understand why FF suggest to create a CNAME record that points out to [*].custom-domain-proxy.flutterflow.app. Why do you need a proxy there?