HTTP 305 status code

305 Use Proxy

The requested resource must be accessed through the specified proxy. The Location field will give the URI information where the specified proxy is located. The recipient needs to repeatedly send a separate request to access the corresponding resource through this proxy. Only the origin server can establish a 305 response.

Note: It is not clear in RFC 2068 that a 305 response is intended to redirect a single request and can only be established by the origin server. Ignoring these restrictions can lead to serious safety consequences.