Direct answer

A migration succeeds when important old URLs resolve cleanly, measurement survives, and surprises are detected quickly.

What to remember
  • Map valuable URLs before launch
  • Test redirects as a graph
  • Preserve a measurable rollback path

01

Before launch

Freeze an inventory of indexable URLs, traffic-bearing landing pages, backlinks, canonicals, titles, structured data, and analytics behavior.

  • Approve a one-to-one redirect map
  • Crawl staging behind access control
  • Verify production DNS and certificates
  • Name the rollback owner

For every old route, explicitly choose whether it should redirect, remain accessible as a canonicalized duplicate, return not found, or retain a separate indexable identity. The URL control decision guide provides the decision framework.

02

At launch

Test representative URLs across every template and redirect rule. Confirm that production navigation, canonicals, robots rules, sitemaps, and measurement all reference the final hostname.

Use the Redirect Chain Visualizer on representative legacy URLs before launch approval.

03

After launch

Monitor server errors, redirect chains, index coverage, Search Console signals, and revenue-critical landing pages. Triage by business consequence, not by raw error count.

References

Sources behind this record

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Corrections

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Claim limit

This article is a decision aid, not a universal ranking rule. Verify the conditions on your own site and preserve a baseline before changing them.