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When using SSO (e.g.: using ceph-dev instructions) and before even the log-in form is displayed, the following white error page appears:

{"status": "415 Unsupported Media Type", "detail": "Unable to find version in request header", "request_id": "206841b7-d745-4fdb-ae41-919d3c7fa64b", "traceback": "Traceback (most recent call last):\n  File \"/usr/lib/python3.6/site-packages/cherrypy/_cprequest.py\", line 638, in respond\n    self._do_respond(path_info)\n  File \"/usr/lib/python3.6/site-packages/cherrypy/_cprequest.py\", line 697, in _do_respond\n    response.body = self.handler()\n  File \"/usr/lib/python3.6/site-packages/cherrypy/lib/encoding.py\", line 219, in __call__\n    self.body = self.oldhandler(*args, **kwargs)\n  File \"/usr/lib/python3.6/site-packages/cherrypy/_cptools.py\", line 230, in wrap\n    return self.newhandler(innerfunc, *args, **kwargs)\n  File \"/ceph/src/pybind/mgr/dashboard/services/exception.py\", line 55, in dashboard_exception_handler\n    raise error\n  File \"/ceph/src/pybind/mgr/dashboard/services/exception.py\", line 46, in dashboard_exception_handler\n    return handler(*args, **kwargs)\n  File \"/usr/lib/python3.6/site-packages/cherrypy/_cpdispatch.py\", line 54, in __call__\n    return self.callable(*self.args, **self.kwargs)\n  File \"/ceph/src/pybind/mgr/dashboard/controllers/__init__.py\", line 691, in inner\n    raise cherrypy.HTTPError(415, \"Unable to find version in request header\")\ncherrypy._cperror.HTTPError: (415, 'Unable to find version in request header')\n", "version": "18.4.0"}