The last two paragraphs in RFC 3261 section 16.5 says:
"If the Request-URI indicates a resource at this proxy that does not exist, the proxy MUST return a 404 (Not Found) response.
If the target set remains empty after applying all of the above, the proxy MUST return an error response,
which SHOULD be the 480 (Temporarily Unavailable) response."
My interpretation of this is that if the domain of the Request-URI indicates a domain this proxy is responsible for, but lookup (but location service, and other local policies) failed, then we return 404.
My question is, when would we ever encounter a case where we should return 480? If the domain of the Request-URI is external (this proxy is NOT responsible for), we would have forwarded the request to that external domain immediately (section 16.5 paragraph 3).
Thanks.
King
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