Unverified50% confidenceConceptExact time
A soft 404 refers to a server returning the HTTP 200 success code for a non-existent path while the actual content is a 'page not found' HTML notice page, causing status-code-based adoption statistics to be inflated.
1
Sources
50%
Confidence
Long-term
Relevance
10/15/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedHTTP status code 200 indicates the page returns normally; 301/302 indicates a redirect, and overly long chains dilute authority; 404 indicates the page does not exist; 410 indicates the content has been permanently removed; 5xx indicates a server error.76% similarUnverifiedHTML files smaller than 256KB are loaded in the preview panel as data: URLs, with a CSP of script-src 'none' and an opaque origin, and inline scripts are blocked.65% similarUnverifiedExternal APIs may still return 200 OK at the HTTP level while the actual content has changed (e.g., pagination logic adjustments, field format changes, rate-limiting policy tightening), creating a blind spot where behavior has changed but the records appear normal.65% similarUnverifiedThe behavior of URL fragments not being sent to the server is established by the RFC 3986 specification, originally designed for in-page navigation.64% similar
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