Thanks for these Tobias,
I took your earlier example and modified to use axios since request is now deprecated.
In case anybody wants…
const axios = require('axios');
let requestSent = false;
let url = 'your.url';
exports.handler = function (app) {
if (requestSent) return;
requestSent = true;
axios.get(url)
.then(() => {
done();
}).catch((err) => {
done(err)
});
};