const errorMessage = err.message.toLowerCase();
if(!errorMessage.includes("socket hang up") || !errorMessage.includes("ECONNRESET")) {
console.warn(`node ${node.processId}/${node.address} failed, unregistering`);
unregister(node);
cleanUpNode(node).then(() => console.log(`cleaned up ${node.processId} presence`));
reqHandler(req, res); // try again!
} else {
res.end();
}