title: Python HTTP server supporting digest auth without session cookies
body: <p>To support some really 3rd-party (and strange) client I need to serve info via http-digest auth, but without session-cookie mechanism.
  By default, <code>flask_httpauth</code> <code>HTTPDigestAuth</code> module working via session-cookies.</p>
  <p>What would be the most easy way to avoid using sessions and just use digest-flow for authentication?</p>
  <p>Thanks!</p>