Why it matters
Google listed four common causes of soft 404s: pages that look like errors, thin or empty content, server or CMS misconfiguration, and JavaScript-dependent content that fails to load. Said at Search Central Live: detection uses a model that understands page layout, so an error message alone in the main content, such as a database connection error, makes a soft 404 even when header and navigation look normal.
How to meet it
Database and backend failures return 503; missing content returns 404 or 410; empty search and filter results return 404 or carry noindex. Client-rendered pages whose data request fails show a retry option and never leave an empty main area on a 200 URL.
How to test it
In staging, simulate a backend outage: pages answer 503, not 200. Crawl for 200 pages with a very short main content or error wording, and review the Page indexing report's soft 404 list after each release.
How Regensbot covers it
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.
Sources
Google documents03
- 01Troubleshoot Google Search crawling errorsGoogle Search Central (opens in a new tab)
- 02How HTTP status codes affect Google's crawlersGoogle (opens in a new tab)
- 03Crawling December: CDNs and crawlingSearch Central blog (24 December 2024) (opens in a new tab)
Claims in the knowledge base10
- D2-C336ConfirmedUnderstanding what's on a pageShown on screen
- D2-C339UndocumentedUnderstanding what's on a pageSaid on stage
- D2-C213ConfirmedLightning session D: Rendering and JavaScriptSaid on stage
- D2-C376SourceHandling web duplicationGoogle's documentation
- D2-C342n/aUnderstanding what's on a pageThe author's interpretation
- D2-C334ConfirmedUnderstanding what's on a pageSaid on stage
- D1-C348ConsistentHow crawling errors affect SearchSaid on stage
- D1-C355ConfirmedHow crawling errors affect SearchSaid on stage
- D1-C320ConsistentHow crawling worksSaid on stage
- D1-C369SourceHow crawling errors affect SearchGoogle's documentation
Claim IDs refer to the Search Central Live 2026 knowledge base. The knowledge base (opens in a new tab)
- Confirmed
- Google's documentation states the same thing.
- 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.