HTTP registry: http_request_error
The intermediary is generating a client (4xx) response on the origin's behalf. Applicable status codes include (but are not limited to) 400, 403, 405, 406, 408, 411, 413, 414, 415, 416, 417, and 429.
Proxy and gateway values describe processing across trust boundaries where fields, authority, and framing may be transformed. http_request_error is registered in HTTP Proxy Error Types. Defining reference: rfc9209.
Identifier (http)
http_request_error
The intermediary is generating a client (4xx) response on the origin's behalf. Applicable status codes include (but are not limited to) 400, 403, 405, 406, 408, 411, 413, 414, 415, 416, 417, and 429.
Strip hop-by-hop data, normalize framing, trust forwarded metadata only from configured proxies, and avoid exposing topology or credentials.
This registry value is currently marked active by IANA. Follow the defining specification before sending, accepting, or proxying it.
IANA registry: http-proxy-status/http-proxy-error-types
Registry reference: rfc9209
Sources