HTTP registry: proxy_internal_error

The intermediary encountered an internal error unrelated to the origin.

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

httpregistryhttp-proxy-statushttp-proxy-error-types

Identifier (http)

proxy_internal_error

The intermediary encountered an internal error unrelated to the origin.

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