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HTTP_STATUS_FINE
HTTP_STATUS_FINE maps the numeric status 218, commonly labeled This is fine in informal status-code lists. It is not a registered HTTP status code in the current IANA HTTP Status Code Registry. A client that receives an unrecognized 2xx code still treats it as a member of the successful 2xx class for class-based handling, but code-specific semantics cannot be inferred from the HTTP standard.
Do not assume Apache semantics from the number
The Apache HTTP Server ProxyErrorOverride directive controls whether selected backend error responses are replaced by local error-document handling. The current Apache documentation describes overriding responses with status codes 400 and higher; it does not define 218 as a standardized signal for that mechanism. When 218 appears in logs or a capture, identify the exact origin server, proxy module, framework, or application that generated the response and use that implementation's contract.
For protocol debugging, record the response headers and body and compare behavior with an ordinary registered 2xx status. Do not build interoperable API logic around the label This is fine unless both endpoints explicitly document their private use of 218.
References
- IANA HTTP Status Code Registry — authoritative registry of assigned HTTP status codes.
- RFC 9110, Status Codes — handling of unrecognized status codes by class.
- Apache HTTP Server: ProxyErrorOverride — documented proxy error-response override behavior.
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