Official statement
Other statements from this video 28 ▾
- 4:42 Le nombre de pages en noindex impacte-t-il vraiment le classement SEO ?
- 4:42 Trop de pages en noindex pénalisent-elles vraiment le classement ?
- 6:02 Les pages 404 dans votre arborescence tuent-elles vraiment votre crawl budget ?
- 6:02 Les pages 404 dans la structure d'un site nuisent-elles vraiment au crawl ?
- 7:55 Faut-il vraiment s'inquiéter d'avoir plusieurs sites avec du contenu similaire ?
- 7:55 Peut-on cibler les mêmes requêtes avec plusieurs sites sans risquer de pénalité ?
- 12:27 Faut-il vraiment vérifier les Webmaster Guidelines avant chaque optimisation SEO ?
- 16:16 La conformité technique garantit-elle vraiment un bon SEO ?
- 19:58 Pourquoi une redirection HTTPS vers HTTP peut-elle paralyser votre indexation ?
- 19:58 Faut-il vraiment supprimer tous les paramètres URL de vos pages ?
- 19:58 Faut-il vraiment déclarer une balise canonical sur toutes vos pages ?
- 21:07 Faut-il vraiment abandonner les paramètres d'URL pour des structures « significatives » ?
- 21:25 Faut-il vraiment mettre une balise canonical sur TOUTES vos pages, même les principales ?
- 22:22 Google peine-t-il vraiment à distinguer sous-domaine et domaine principal ?
- 25:27 Faut-il vraiment séparer sous-domaines et domaine principal pour que Google les distingue ?
- 26:26 La réputation locale suffit-elle à déclencher le référencement géolocalisé ?
- 29:56 Contenu mobile ≠ desktop : pourquoi Google pénalise-t-il encore cette pratique après le Mobile-First Index ?
- 29:57 Peut-on vraiment négliger la version desktop avec le mobile-first indexing ?
- 43:04 L'API d'indexation garantit-elle vraiment une indexation immédiate de vos pages ?
- 43:06 La soumission d'URL dans Search Console accélère-t-elle vraiment l'indexation ?
- 44:54 Pourquoi Google refuse-t-il systématiquement de détailler ses algorithmes de classement ?
- 46:46 Faut-il vraiment choisir entre ciblage géographique et hreflang pour son référencement international ?
- 46:46 Ciblage géographique vs hreflang : faut-il vraiment choisir entre les deux ?
- 53:14 Faut-il vraiment afficher toutes les images marquées en données structurées sur vos pages ?
- 53:35 Pourquoi Google interdit-il de marquer en structured data des images invisibles pour l'utilisateur ?
- 64:03 Faut-il vraiment normaliser les slashs finaux dans vos URLs ?
- 66:30 Faut-il vraiment ignorer les erreurs non résolues dans Search Console ?
- 66:36 Faut-il s'inquiéter des erreurs 5xx résolues qui persistent dans Search Console ?
Google states that an incorrect redirection from HTTPS to HTTP blocks the resolution of canonicalization issues. In practice, this means the engine cannot consolidate signals between versions of the same URL. For an SEO, this is a red flag: any redirection must strictly go from HTTP to HTTPS, never the other way around, or you risk creating unresolved duplicates.
What you need to understand
What is an HTTPS to HTTP redirection and why does it happen? <\/h3>
An HTTPS to HTTP redirection <\/strong> is a reverse configuration of what is usually expected. It forces a secure URL (https:\/) to redirect to its non-secure version (http:\/). This scenario typically occurs due to a server misconfiguration, an oversight in the .htaccess rules, or a poorly managed SSL migration.<\/p> In practice, an SEO practitioner encounters this problem when an audit reveals that certain HTTPS pages redirect to HTTP. This occurs more often than one might think: a developer modifies a rewrite rule without checking the entire chain, or a misconfigured CMS forces the legacy protocol. The result? A contradictory signal <\/strong> sent to Google.<\/p> Canonicalization <\/strong> is the process by which Google chooses which version of a URL to index when multiple versions exist (http vs https, www vs non-www, trailing slash vs non-trailing slash). When a redirection goes from HTTPS to HTTP, the engine receives a contradictory instruction in light of its preference policy for HTTPS.<\/p> Google cannot consolidate signals — backlinks, authority, history — between two versions pointing in the wrong direction. The crawl budget dilutes, ranking signals fragment, and the page loses visibility. This is a technical blockage <\/strong> that prevents the algorithm from resolving which is the master URL.<\/p> When Google detects this configuration, it can't determine which version to favor. The two URLs (HTTP and HTTPS) remain in competition in the index, diluting relevance signals. The result: loss of rankings <\/strong>, duplicate pages in Search Console, and unresolved canonicalization warnings.<\/p> In practice, the affected pages may see their organic traffic drop by 30% to 60% because Google hesitates between the two versions and ends up favoring none. Backlinks pointing to HTTPS do not pass their juice to HTTP (or vice versa), creating an authority leak <\/strong>.<\/p>How does this redirection block canonicalization? <\/h3>
What is the concrete impact on indexing and ranking? <\/h3>
SEO Expert opinion
Is Google's directive consistent with on-the-ground practices? <\/h3>
Yes, and it is even one of the rare statements where Google leaves no ambiguity. Since the widespread adoption of HTTPS as a ranking factor (2014) and the 'not secure' labeling in Chrome (2018), the direction is clear: HTTPS is the standard <\/strong>, HTTP is obsolete. Any reverse redirection is a technical regression that the algorithm cannot tolerate.<\/p> On the ground, observed cases confirm this position. Sites that redirect HTTPS to HTTP systematically lose visibility, accompanied by explicit warnings in Search Console. No exceptions, no nuances — it's a binary blockage <\/strong>.<\/p> The main nuance concerns diagnosis. Google speaks of 'incorrect redirection' but does not specify if a complex redirection chain <\/strong> (e.g., HTTPS → HTTP → HTTPS) produces the same effect. According to field tests, yes: any loop or intermediate reversal blocks canonicalization, even if the final destination is HTTPS. [To be verified] <\/strong>: Google doesn't document the tolerance threshold for nested redirection chains.<\/p> Another point: some sites use HTTP for internal resources (admin, staging) with a robots.txt block. In this case, the HTTPS → HTTP redirection in these areas does not impact SEO — but this is an edge case. The general rule remains: never redirect from HTTPS to HTTP on public URLs <\/strong>.<\/p> Honestly? No legitimate cases. A redirection from HTTPS to HTTP has no technical or SEO justification. It is always an error, never a strategy. The only scenarios where this occurs are accidental: failed SSL migration, incorrect Apache/Nginx rule, or misconfigured CMS.<\/p> The real risk is the lack of detection <\/strong>. These redirections go under the radar if the SEO audit does not systematically test both protocols. A tool like Screaming Frog configured to crawl HTTP and HTTPS separately reveals these inconsistencies — but one must still do it.<\/p>What nuances should be added to this statement? <\/h3>
In what cases could this rule pose a problem? <\/h3>
Practical impact and recommendations
What concrete steps can be taken to avoid this blockage? <\/h3>
First step: audit all redirections <\/strong> between HTTP and HTTPS across all templates, subdomains, and critical paths. Use a crawler configured to test both protocols, and ensure that every HTTP URL redirects with a 301 to its HTTPS equivalent — never the other way around.<\/p> Next, clean up server rewrite rules (.htaccess, nginx.conf, IIS web.config). A poorly ordered rule can create a loop or a reversal. The principle: one global rule <\/strong> that forces HTTPS for the entire domain, without exception, with a high priority in the execution chain.<\/p> Search Console reports canonicalization problems <\/strong> in the 'Coverage' tab. Look for warnings like 'URL redirected to HTTP while HTTPS exists.' If you see this warning, Google has detected the inversion.<\/p> Complete this with a manual test: open an HTTPS URL in a browser and observe the address bar. If it switches to HTTP, it is confirmed. For a thorough diagnosis, export all URLs from the HTTPS sitemap and test them with a cURL script that follows the redirections. Any 301/302 code pointing to HTTP is a critical urgency <\/strong>.<\/p> Do not fix the redirections one by one — it is unmanageable and prone to omissions. Implement a global server rule <\/strong> that forces HTTPS for all incoming HTTP traffic. This rule must be the first executed, before any other URL rewriting.<\/p> Avoid also creating unnecessary redirection chains. If a URL is already redirecting to another (e.g., www canonicalization), ensure that the first redirection forces HTTPS immediately. The goal: maximum one redirection <\/strong> between the entry URL and the final canonical URL.<\/p>How to detect an existing HTTPS to HTTP redirection? <\/h3>
What mistakes to avoid during correction? <\/h3>
❓ Frequently Asked Questions
Une redirection HTTPS vers HTTP impacte-t-elle uniquement la canonicalisation ou aussi le crawl budget ?
Un certificat SSL expiré crée-t-il le même problème qu'une redirection HTTPS vers HTTP ?
Combien de temps faut-il pour que Google résolve la canonicalisation après correction d'une redirection HTTPS vers HTTP ?
Les backlinks pointant vers HTTP sont-ils perdus si on force HTTPS après avoir corrigé une redirection inverse ?
Peut-on utiliser une balise canonical au lieu d'une redirection 301 pour résoudre ce problème ?
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Other SEO insights extracted from this same Google Search Central video · duration 1h13 · published on 22/04/2021
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