curl -ks -XPOST -H"Accept: application/json" -H"X-Auth-Token: ..." http://localhost:8000 -d client='runner' -d expr_form="list" -d tgt='master.novalocal,slave.novalocal' -d fun='state.orchestrate' -d arg='basic_cluster.orchestrate'
{
  "return": [
    "Exception occurred in runner state.orchestrate: Traceback (most recent call last):\n  File \"/usr/lib/python2.7/site-packages/salt/client/mixins.py\", line 293, in low\n    expected_extra_kws=CLIENT_INTERNAL_KEYWORDS\n  File \"/usr/lib/python2.7/site-packages/salt/utils/__init__.py\", line 804, in format_call\n    used_args_count\nSaltInvocationError: orchestrate takes at least 1 argument (0 given)\n"
  ]
}