title: Python session SAMESITE=None not being set
body: <p>I am having issues with chrome and SameSite. I am serving a webpage in a shopify iframe and when setting the session using flask-login, chrome tells me this:</p>
  <blockquote>
  <p>A cookie associated with a cross-site resource at
  URL was set without the
  <code>SameSite</code> attribute. It been blocked, as Chrome now only delivers
  cookies with cross-site requests if they are set with <code>SameSite=None</code>
  and <code>Secure</code>.</p>
  </blockquote>
  <p>Secure is set, but I tried to set SameSite in all the possible way, but without effect.</p>
  <p>I tried setting</p>
  <blockquote>
  <p>app.config['SESSION_COOKIE_SAMESITE'] = &quot;None&quot;</p>
  </blockquote>
  <p>I tried, changing the behavior of the library, I tired setting the attribute in set_cookie() but nothing seemed to work. The response I see doesn't have the SameSite attribute.</p>
  <p>(I have the last versions of flask, flask-login, flask-security and werkzeug)</p>
  <p>Can you help me?</p>
  <p>Thank you</p>