What does HTTP status 305 (Use Proxy) mean?

Status / error code:		Category:

Constant name:
Source:		Operating System:
Description: HTTP 305 is a deprecated status code that once indicated that the requested resource was available only through a proxy.

Could be also:
Constant	Type	OS
ERROR_SHORT_NAMES_NOT_ENABLED_ON_VOLUME	Win32 error	Windows
INVALID_EXTENDED_PROCESSOR_STATE	BugCheck Code	Windows

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HTTP_STATUS_NOT_MODIFIED	HTTP_STATUS_SWITCH_PROXY

HTTP_STATUS_USE_PROXY

Current HTTP specifications mark 305 as deprecated because proxy configuration through a response can create security and interoperability problems. Modern applications should use explicit network configuration or documented redirect behavior instead.

If a legacy system returns 305, inspect the product documentation and proxy policy rather than automatically switching transport endpoints based on the response.

Modern clients should not implement 305 as an instruction to route the request through the URI supplied by an untrusted response. The status was deprecated because of security concerns around proxy configuration. If it appears in old software, treat it as legacy behavior and verify the intended proxy configuration independently.

RFC 9110: HTTP Semantics

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