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If facet URLs must be crawlable, use & separators, a fixed filter order and 404 for empty results

Level
Should

Recommended: skip it only for a reason you can name.

Documentation

Documented

At least one cited Google document states or supports it.

Area
URLURLs, links and discovery
Covered

Automatic

Decided from one URL.

Why it matters

Google's faceted navigation guide asks crawlable facet URLs to use the standard & separator, keep filters in a consistent order and return 404 when a combination has no results. Said at Search Central Live: many similar-looking URLs leading to the same or empty content can make Google fold a whole URL pattern into one canonical and stop crawling new URLs that fit it.

How to meet it

Normalise the parameter order on the server (redirect or canonicalise ?size=m&color=red and ?color=red&size=m to one order). Use key=value pairs joined with &, not custom separators. Return 404, not an empty 200 page, for combinations with no items. Make indexable facet pages differ in their main content (heading, introduction, items), not only in the title.

How to test it

Request one combination in two parameter orders: one redirects or canonicalises to the other. curl -I on an empty combination returns 404. The Page indexing report shows no growth of duplicate reasons on facet URLs.

How Regensbot covers it

AutomaticNeedsOne URL

Decided from one URL.

An audit reads the response, the headers, the HTML, robots.txt, the sitemaps and the structured data, and the finding shows the evidence it saw.

How verdicts workWhat you connect

Sources

Google documents02

  1. 01Managing crawling of faceted navigation URLsGoogle (opens in a new tab)
  2. 02Fix canonicalization issuesGoogle Search Central (opens in a new tab)

Claims in the knowledge base05

  1. D1-C102SourceHow Google thinks about crawl budgetGoogle's documentation
  2. D2-C371ConsistentHandling web duplicationShown on screen
  3. D2-C368UndocumentedHandling web duplicationShown on screen
  4. D2-C369UndocumentedHandling web duplicationShown on screen
  5. D2-C372n/aHandling web duplicationThe author's interpretation

Claim IDs refer to the Search Central Live 2026 knowledge base. The knowledge base (opens in a new tab)

Consistent
Google's documentation supports it without stating it.
Undocumented
Said or shown at the event, not in the documentation.
Source
The claim is the cited document itself.
n/a
Nothing to verify: a quotation, framing, opinion or analysis.

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