If you reverted a Lovable or ZIP-uploaded landing page and the staging preview now shows a "Blocked request / host not allowed" error, a fix has been deployed. Re-run the revert, or make a small edit and republish to force a rebuild, then hard-refresh the preview.
🔍 What's Happening
After you use the revert feature to roll back a Lovable or ZIP-uploaded landing page (a react_source project) in the Website Builder / Landing Page Studio, the staging preview can fail to load.
The preview engine (Vite, the build tool that renders your staging preview) blocks the preview subdomain and shows a "Blocked request / host not allowed" style error. When this happens, the reverted page will not render in the preview tab.
Who is affected
- Customers using the Website Builder / Landing Page Studio.
- Projects created from a Lovable or ZIP upload (a
react_sourceproject). - Only after the revert action is used to roll back the project.
If you have not reverted a Lovable/ZIP project, this issue does not apply to you.
🛠️ Workaround Steps
A fix is now live. Follow these steps in order to restore your staging preview:
- Re-run the revert on the affected Lovable/ZIP project. With the fix deployed, this re-applies the correct preview host configuration.
- If the preview is still blocked, make a small trivial edit and re-deploy/republish. This forces the project to rebuild and re-apply the preview host settings.
- Hard-refresh the preview tab to clear any cached error (
Ctrl + Shift + Ron Windows,Cmd + Shift + Ron Mac).
Once the rebuild completes, your reverted landing page will load in the staging preview as expected.
📡 Engineering Status
Our team is aware of this issue and a fix has been deployed. New reverts and rebuilds will apply the corrected preview host configuration automatically. If you ran a revert before the fix went live, the workaround steps above will restore your preview.
📞 When to Contact Support
If the staging preview is still blocked after you re-run the revert, republish with a small edit, and hard-refresh, reach out to our support team. Please include:
- The project name or URL of the affected Lovable/ZIP landing page.
- A note that the page is a reverted react_source project.
- A screenshot of the "Blocked request / host not allowed" error.
Our team will take a closer look and help you get the preview rendering again.
🎯 You're in good hands — the fix is live, and in most cases re-running the revert and republishing restores your preview right away. If anything still looks off, contact support and we'll take it from there.