curl --location --request GET 'https://slack.com/api/rtm.connect?token='{
    "ok": true,
    "self": {
        "id": "U4X318ZMZ",
        "name": "robotoverlord"
    },
    "team": {
        "domain": "slackdemo",
        "id": "T2U81E2FP",
        "name": "SlackDemo"
    },
    "url": "wss://..."
}