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1Repair Windows errors before they cause bigger problems2Fix the driver behind crashes, sound loss and screen glitches3Clear out junk files and repair common Windows errorsIn the Bean There shop example, a Git branch deploys preview environments for the catalog API, orders API, and web app on Light Cloud. To preview a feature across all three, point the branch services at one another and check their environment variables—but first confirm where their data goes. This example’s preview still uses the production database, so it is not safe for test orders. If a production deployment goes wrong, Light Cloud can serve an earlier deployment’s code; that does not revert the commit or undo database changes.
What a branch preview deploys
This workflow assumes the Bean There apps from Parts 1–4 are already deployed from a fork. The tutorial adds a stock_status field in catalog-api, then pushes a feature branch. In the described Light Cloud setup, creating the branch creates an environment for each of the three apps, including services whose folders did not change. Later pushes redeploy only apps with changed folders.
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That gives you preview URLs for the catalog API, orders API, and web app. A URL alone does not mean the preview is isolated: each app’s environment-variable values determine which services, origins, and data stores it uses.
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Connect the branch apps for a full feature preview
For an API-only check, the branch’s default variables may be enough to test an endpoint with curl. To test the full browser flow, configure the branch environments to route requests among the branch versions rather than production.
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- In the Light Cloud dashboard, open the branch environment for the web app and set its catalog and orders API URL variables to the respective branch API URLs. The tutorial describes these as the web app’s
VITE_*URLs. - Open the branch environment for the orders API and set its catalog API URL to the branch catalog API URL.
- In both branch API environments, set
WEB_ORIGINto the branch web app’s preview URL so browser requests from that origin are allowed. - Save the variables in the branch environments, then reload the preview and test the intended flow.
Keep these changes in the branch environments. Changing production variables is unnecessary for this preview and could redirect production traffic.
Check data targets before testing writes
The tutorial’s example branch catalog API initially points to the production database; its orders API calls the production catalog API, and the web preview calls production APIs until its URLs are changed. Even after routing the apps to branch URLs, the described setup still shares the production database. The tutorial explicitly warns not to place orders in the preview.
Before exercising any write action, verify the database and other external-service targets used by every branch service. Branch-specific service URLs do not by themselves establish that persistent data or connected services are isolated.
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|---|---|---|
| Web app service URLs | Set the branch web app’s catalog and orders API URLs to branch API URLs. | Defaults can still point to production APIs. |
| API-to-API URL | Set branch orders API to call branch catalog API. | The initial orders API calls production catalog. |
| Allowed browser origin | Set each branch API’s WEB_ORIGIN to the branch web URL. |
An API allowing only the production web origin can reject preview requests. |
| Database target | Verify the target before any writes. | The tutorial’s branch catalog API uses the production database; the preview is not data-isolated. |
Use pull-request previews for review
After you open a pull request, the tutorial says Light Cloud posts a preview link for each app and adds a deployment readiness check per app. Reviewers can open the links without access to the Light Cloud console. This makes it possible to review the web app and APIs through their preview URLs, provided their routing and data targets are appropriate for the tests being performed.
After the branch is merged and deleted, the changed services redeploy and the three branch environments disappear, according to the demonstrated workflow.
Roll back a bad production deployment
Rollback addresses the deployed application version, not the entire state of a system. In the tutorial, the author introduces a faulty price conversion on main, then opens the catalog API’s Production > Deployments tab in Light Cloud and rolls back to the previous good deployment.
- In Light Cloud, open the affected app’s production environment and go to Deployments.
- Choose the earlier known-good deployment and select the rollback action.
- Review the confirmation details before confirming. The tutorial says rollback serves the selected earlier code without rebuilding, leaves current environment variables unchanged, and does not undo database changes made since that deployment.
For the tutorial’s catalog API test, Julia reports that rollback took 13 seconds, compared with about 70 seconds for a normal deploy in that example. These are author-reported timings, not a performance guarantee or independent benchmark.
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Rolling back the deployment does not remove the faulty commit from main. The tutorial follows the rollback by reverting the bad commit and pushing that revert. The distinction matters: rollback changes which deployed code is being served, while the follow-up revert repairs the branch’s source history so a later deployment does not simply reintroduce the fault.
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Troubleshoot a branch preview
The preview shop shows production data, not my change
Check the branch web app’s VITE_* API URL variables. If they still contain production URLs, the web preview continues to request production APIs. Set them in the branch web environment to the branch API URLs, and confirm the branch APIs are also routed to one another. Separately verify the database target: changing service URLs does not make the example’s production database branch-specific.
The preview shop shows a CORS error
Check WEB_ORIGIN in each branch API environment. The tutorial attributes this failure to APIs allowing only the origin configured there; add the branch web app’s preview URL to the branch API configuration. Make the adjustment in the branch environment rather than production.
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