Facility Control

Hi all,

I'm trying to use ogscript.asyncHTTP() in a DashBoard panel button to send a GraphQL POST request to an external API endpoints that requires an Authorization: Bearer <token> header. According to forum posts (e.g. James Peltzer's 2021 reply) and the manual, I understand we can send custom headers by passing a JSON object in place of the Content-Type string.

ogscript.log("Initializing GraphQL request...");

function callback(result) {
    ogscript.log("Callback fired");
    try {
        var response = JSON.parse(result);
        ogscript.log("Parsed GraphQL response: " + JSON.stringify(response));
    } catch (e) {
        ogscript.log("Raw result: " + result);
    }
}

var headers = {
    "Authorization": "Bearer xxxxxxxx",
    "Content-Type": "application/json"
};

ogscript.log("Headers and payload prepared.");

var data = JSON.stringify({
    query: `mutation {
        DeviceRxChannelsSubscriptionSet(input: {
            deviceId: "c22ec0202cf148478be5977d4d6e0d4d",
            subscriptions: [
                { rxChannelId: 1, rxChannelIndex: 1, subscribedDevice: "AVoIP-Church-Computer-OBS", subscribedChannel: "Left" },
                { rxChannelId: 2, rxChannelIndex: 2, subscribedDevice: "AVoIP-Church-Computer-OBS", subscribedChannel: "Right" },
                { rxChannelId: 3, rxChannelIndex: 3, subscribedDevice: "AVoIP-Church-Computer-OBS", subscribedChannel: "Center" },
                { rxChannelId: 4, rxChannelIndex: 4, subscribedDevice: "AVoIP-Church-Computer-OBS", subscribedChannel: "LFEScreen" },
                { rxChannelId: 5, rxChannelIndex: 5, subscribedDevice: "AVoIP-Church-Computer-OBS", subscribedChannel: "LeftSurround" },
                { rxChannelId: 6, rxChannelIndex: 6, subscribedDevice: "AVoIP-Church-Computer-OBS", subscribedChannel: "RightSurround" }
            ]
        }) {
            ok
        }
    }`
});

ogscript.log("Sending asyncHTTP request...");
ogscript.asyncHTTP(
    "https://URL:443/graphql",
    "POST",
    headers,
    data,
    callback
);

What I'd Like Help With:

Does ogscript.asyncHTTP() support custom headers in my version of DashBoard (how can I confirm that definitively)? 
I don't understand how to follow and debug my script, what am I doing or not doing?

Thanks