Comment 2 for bug 1215491

Reviewed: https://review.openstack.org/43476
Committed: http://github.com/openstack/swift/commit/9807a358c6d1314d25e3a41da75be5851fa0ac27
Submitter: Jenkins
Branch: master

commit 9807a358c6d1314d25e3a41da75be5851fa0ac27
Author: Donagh McCabe <email address hidden>
Date: Fri Aug 23 15:03:08 2013 +0100

    Add WWW-Authenticate to 401 responses

    Per http://www.ietf.org/rfc/rfc2616.txt, when a 401 error is returned, the
    Www-Authenticate response header MUST also be returned. The format is
    described in http://www.ietf.org/rfc/rfc2617.txt.

    Swift supports and/or implements a number of authentication schemes
    including tempauth, Keystone, tempurl, formpost and container sync. In
    this fix, we use a catch-all, "Swift". The realm is the account (where
    known) or "unknown" (bad path or where the 401 is returned from code
    that does not have the request). Examples:

         Www-Authenticate: Swift realm="AUTH_1234567889"
         Www-Authenticate: Swift realm="unknown"

    Fixes bug #1215491

    Change-Id: I03362789318dfa156d3733ef9348795062a9cfc4