Modification of a NamespaceForward entity fails because the HTTP PUT request appears to be passed by the NGINX proxy server to the delegationTarget rather than acting on the NamespaceForward resource itself.
Obviously, the delegated resource should not be expected to handle a PUT request (& the resource may be hosted on some 3rd party server subject to completely different management rules!).
I have only tried this with code "200" specified; proxy mode.
Modification of a NamespaceForward entity fails because the HTTP PUT request appears to be passed by the NGINX proxy server to the delegationTarget rather than acting on the NamespaceForward resource itself.
Obviously, the delegated resource should not be expected to handle a PUT request (& the resource may be hosted on some 3rd party server subject to completely different management rules!).
I have only tried this with code "200" specified; proxy mode.