305 Use Proxy

305 Use Proxy is a deprecated status code. Using the status-code a server could instruct a client that it should connect to a proxy, and repeat that same request there.

305 kind of works like a redirect. It really tells a client: this resource can only be fetched if you used the right proxy. Presumably a client could connect to this proxy and via the proxy try the exact same request again to get the real response.

305 Use Proxy is deprecated due to security concerns. It shouldn’t be used. I’m not aware of any implementors, although they might be out there.

Example

The following response would tell a client that it should attempt the same request again via a proxy on proxy.example.org.

HTTP/1.1 305 Use Proxy
Location: https://proxy.example.org:8080/

References

HTTP series

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Informational 1xx

Successful 2xx

Redirection 3xx

Client Error 4xx

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