HTTP registry: destination_ip_unroutable

The intermediary cannot find a route to the next-hop IP address.

Proxy and gateway values describe processing across trust boundaries where fields, authority, and framing may be transformed. destination_ip_unroutable is registered in HTTP Proxy Error Types. Defining reference: rfc9209.

httpregistryhttp-proxy-statushttp-proxy-error-types

Identifier (http)

destination_ip_unroutable

The intermediary cannot find a route to the next-hop IP address.

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

HTTP Proxy Error Types
rfc9209