GitHub user dosubot[bot] added a comment to the discussion: Getting 404 error 
on welcome page

<!-- Answer -->
Your config and proxy setup are correct, but Superset 6.0.0 has known, 
unresolved bugs with subpath deployments—especially double prefixing and 404s 
after login or navigation. These issues are fixed only in releases after late 
2025 (see [PR #35098](https://github.com/apache/superset/pull/35098) and 
related discussions). The API works because backend routing is less affected, 
but the UI and static assets break due to these bugs.

If you can, upgrade to a Superset version that includes or is newer than PR 
#35098. If upgrading isn’t possible, you’ll keep hitting these 404s and 
double-prefix issues—there’s no robust workaround in 6.0.0. For now, 
double-check that your Istio rewrite and headers are consistent, and that 
you’re not setting both the prefix in the path and in headers at the same time. 
If you must stay on 6.0.0, consider using a subdomain instead of a subpath, or 
apply a targeted patch from the PR above.

Let me know if you want a checklist for subpath deployment or help reviewing 
your exact Istio YAML for any subtle issues.


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GitHub link: 
https://github.com/apache/superset/discussions/37655#discussioncomment-15691143

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