// http header · response header
WWW-Authenticate
Authentication scheme for a 401
What the WWW-Authenticate header does
WWW-Authenticate is sent with a 401 Unauthorized to tell the client which authentication scheme to use, such as Bearer or Basic. It's the server's way of saying 'authenticate like this and try again.'
Example
WWW-Authenticate: BearerWhere it's used
WWW-Authenticate is a response header. Response headers are sent by the server to describe the response and tell the client how to handle it.
Other response headers
Content-Encoding Content-Disposition ETag Last-Modified Location Set-Cookie Server Retry-After WWW-Authenticate