CHECK GLOSSARY · WWW-001

www and non-www both serve the site

In plain words: Two live hostnames create duplicate copies of every page.

How to fix it

Redirect one hostname to the other with a 301.

Official sources

• Google: canonicalization

Related checks

• TLS-002: Outdated TLS version
• HTTP2-001: HTTP/2 not enabled
• COMPRESS-001: No text compression
• TTFB-001: Slow server response

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