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HTTP_STATUS_BLOCKED
Because 450 is vendor-specific, it should be interpreted together with the response body and the filtering product that produced it. It is not interoperable with the standard 4xx definitions.
For a user, the relevant action is to review the device or family-safety policy. For a site operator, capture the filtering product and request details rather than changing server routing or content blindly.
IANA HTTP Status Code Registry
Operational meaning of HTTP 450 for HTTP_STATUS_BLOCKED
HTTP 450 (HTTP_STATUS_BLOCKED) is a client-error response. AllStat records its meaning as “450 Blocked by Windows Parental Controls”. For HTTP_STATUS_BLOCKED, interpret it with the request method, selected representation, response headers, and the specification or product that defines the code; the number alone does not prove that application work completed.
Client and server handling for HTTP_STATUS_BLOCKED
- Treat HTTP_STATUS_BLOCKED as a condition visible at the request boundary; inspect authentication, syntax, preconditions, routing, and resource state before retrying.
- For HTTP_STATUS_BLOCKED, preserve the response body and challenge or retry-related headers because they often carry the actionable reason.
- For HTTP_STATUS_BLOCKED, automatic retry is safe only when the method and status contract allow it and the request has been corrected.
For telemetry, record HTTP 450, method, authority, route template rather than secrets, response headers relevant to caching or retry, latency, upstream identity, and whether the response originated at the application or an intermediary.
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