Should you worry about HTTP crawl errors after migrating to HTTPS?

Why does Google still crawl old HTTP URLs?

When you migrate to HTTPS, Google doesn't instantly switch all its internal signals. The search engine continues to discover incoming links that point to your old HTTP URLs, whether through external backlinks, archived social shares, or pages still indexed elsewhere on the web.

These crawl attempts generate 301 errors in the Search Console, which may seem alarming at first. But this is expected behavior: Googlebot follows the links it finds, checks the destination, and records the redirect. The problem arises only if these redirects do not function or point to non-existent pages.

What’s the difference between a legitimate error and a false signal?

A legitimate crawl error indicates a real dysfunction: broken redirect, redirect chain, invalid SSL certificate, or worse, total lack of redirection. In this case, Google may lose link equity and your rankings may drop.

A false signal is what Mueller describes: errors related to the HTTP version that occur because Google is trying to access these URLs from external sources. If your 301 redirects are working correctly, these errors have no negative impact on your ranking. They simply reflect normal crawling activity.

How does Google handle 301 redirects to HTTPS?

Google follows 301 redirects and transfers most of the PageRank from the old URL to the new one. The process is not instantaneous: it can take several weeks for all HTTP URLs to disappear from the index and for signals to consolidate on the HTTPS versions.

In the meantime, Googlebot continues to test the old addresses, especially those discovered via recent backlinks. This is a mechanism of ongoing validation, not a bug. As long as the redirect responds correctly with a 301 code and points to the correct HTTPS destination, everything works as intended.

• Post-migration HTTP crawl errors are normal if external links still point to these addresses
• A functioning 301 redirect is enough to preserve link equity and ranking
• Signal consolidation takes time: several weeks or even months depending on the size of the site
• Monitoring redirect chains and SSL certificates remains essential
• The Search Console displays these errors for transparency, not because they negatively affect SEO

Does this statement truly reflect what we observe on the ground?

Yes, it is consistent with the HTTPS migrations I have assisted with. After a switch, it is standard to see a spike in 301 errors in the Search Console. These errors gradually decrease as Google updates its internal indexes and the backlinks are updated by webmasters.

However, Mueller omits an important detail: if these errors persist for several months without decreasing, it is a warning signal. Either your internal linking still contains HTTP links (which is a basic error), or you have redirect chains that slow down crawling. [To check]: Google never specifies at what threshold these errors become problematic.

What nuances should be added to this statement?

The statement is technically correct but can be misleading. It implies that all HTTP errors are minor after a migration, which isn’t true. If your redirects are misconfigured, if you have forgotten certain URLs or created redirect loops, these errors indicate a real problem.

Another rarely mentioned point: Google treats temporary redirects (302) and permanent ones (301) differently. If you mistakenly use 302s, the SEO signals do not transfer correctly. The errors displayed in the Search Console will be identical, but the impact on ranking will be real. Checking the type of redirect is therefore crucial.

[To check]: Mueller does not quantify the normal consolidation time. Based on my observations, a medium-sized site (a few thousand pages) sees HTTP errors decrease by 70-80% in 2-3 months. If this is not the case, there is likely a structural issue.

When does this rule not apply?

If your HTTPS migration was poorly executed, these errors are not trivial. For example, if you redirected all your old URLs to the HTTPS homepage (a classic error), Google will record 301s but lose the specific signals of each page. The result: guaranteed traffic drop.

Another scenario: an invalid or expired SSL certificate. Google will attempt to crawl the HTTPS version, fail, and continue to see HTTP errors without the redirects being at fault. In this scenario, the errors signal a critical issue that blocks indexing. Monitoring Core Web Vitals and HTTPS response times is just as important as the redirects themselves.

What should you specifically check after a HTTPS migration?

Start by ensuring that every HTTP URL properly redirects to its HTTPS equivalent with a 301 code. Use a crawler like Screaming Frog or Sitebulb to identify any redirect chains (HTTP → HTTP → HTTPS) that dilute PageRank and slow down crawling.

Next, audit your internal linking: no internal link should point to the old HTTP URLs. Even if redirects work, forcing Google to follow 301s with each crawl wastes crawl budget and slows down indexing. Fix all hardcoded links in your templates, menus, and content.

How to interpret crawl errors in the Search Console?

Open the Coverage report and filter for 301 errors. If they pertain to HTTP URLs and their number is gradually decreasing, it's normal. If they stagnate or increase, export the list and identify the backlink sources that still point to these addresses.

Contact the most authoritative sites to request an update of links to your HTTPS versions. For the others, let the redirects do their job. Google will eventually consolidate the signals, even if it takes a few months. Focus on errors that are not 301s: those signal real malfunctions.

What critical mistakes to avoid during an HTTPS migration?

Never redirect all your URLs to the homepage. Each old URL must point to its exact HTTPS equivalent. Do not mix 301 and 302 redirects: only 301s transfer PageRank. Check that your SSL certificate covers all used subdomains (www, blog, shop, etc.).

Update your XML sitemap to ensure it contains only HTTPS URLs. Submit it via the Search Console and check that Google properly crawls the new versions. Finally, configure an HSTS rule to force browsers to always load the HTTPS version, which eliminates attempts to access HTTP on the client side.

• Ensure that each HTTP URL correctly redirects to its exact HTTPS equivalent with a 301
• Audit internal linking and correct all HTTP links
• Update the XML sitemap to include only HTTPS URLs
• Check redirect chains and eliminate them
• Monitor Search Console errors and distinguish false signals from real issues
• Configure HSTS to enforce HTTPS on the browser side