httpwg
multiple locations for 301/308 redirects?
https://httpwg.org/specs/rfc9110.html#status.301:
The 301 (Moved Permanently) status code indicates that the target resource has been assigned a new permanent URI and any future references to this resource ought to use one of the enclosed URIs.
Where would these additional locations come from?
(similar text is present for 308)
In the hypertext content. They used to be in the URI or Alternates header fields as well, but now just the content. Location only contains the preferred reference.
Then we should clarify that in the future. We also need to make the temporary and permanent redirect descriptions consistent (or is there a reason why the description for 302 is different with respect to this?).
Think of it this way: 301 was originally designed for authoring tools (TimBL's editor), not web browsers. The content of a 301 response might be a very lengthy explanation of where the resource has moved and why you might want to choose one of many possible replacement links instead of the one being edited into your current document. 302, in contrast, is meant for redirects where the original request URI is still the preferred way to access the resource, and thus only applies to the current browser session.
Ok, that makes sense.
I belive it would be good if the introduction contained a short paragraph explaining why temporary and permanent redirects are different with respect to this.