host duplicate
The www and bare forms of a domain both answering 200 with the same page, neither redirecting to the other. Two addresses for one page are two candidates for one query, and the canonical tag, if present, is a hint the engine may not take.
What host duplicate means
The www and bare forms of a domain both answering 200 with the same page, neither redirecting to the other. Two addresses for one page are two candidates for one query, and the canonical tag, if present, is a hint the engine may not take. The fix is one host that answers and every other host that redirects to it.
What host duplicate can and cannot support
| It can support | It cannot support |
|---|---|
| The fix is one host that answers and every other host that redirects to it. | The www and bare forms of a domain both answering 200 with the same page, neither redirecting to the other. Two addresses for one page are two candidates for one query, and the canonical tag, if present, is a hint the engine may not take. |
How CrawlCheck measures host duplicate
One finding code in the scanner read this. The share of all scans carrying each is computed from the live corpus when this page is served, not typed into it.
| Finding code | Share of scans | Guide |
|---|---|---|
HOST_DUPLICATE_200 | 3.3% | Canonical URL audit: one page, one address, and the three ways a site publishes it twice |
Every code, its rule and its current rate: the dataset page. Scan a site to see which apply to it.
Terms this definition uses
Related terms in Machine files
The files addressed to machines rather than readers, and what publishing one does and does not buy.
llms.txt · llms-full.txt · agents.md · entity map · entity map parity · machine layer · well-known URI · MCP · agent card · sitemap index · OpenAPI specification · ai.txt · Tool definition · SKILL.md · sitemap origin error · soft 404 on a machine file · tdmrep.json · TDM exception · security.txt · Content Signals · HTTP Message Signatures · changefreq and priority · staging leak
Questions about host duplicate
What is host duplicate?
The www and bare forms of a domain both answering 200 with the same page, neither redirecting to the other. Two addresses for one page are two candidates for one query, and the canonical tag, if present, is a hint the engine may not take.
What does host duplicate not show or guarantee?
The www and bare forms of a domain both answering 200 with the same page, neither redirecting to the other. Two addresses for one page are two candidates for one query, and the canonical tag, if present, is a hint the engine may not take.
How does CrawlCheck measure host duplicate?
Through the finding code HOST_DUPLICATE_200, each with a stated rule, evidence bytes and a live share of scans on the dataset page.
Which area of the glossary does host duplicate belong to?
Machine files: The files addressed to machines rather than readers, and what publishing one does and does not buy.
See it in the full glossary · 668 terms across 19 areas.