We've been wanting a specific mattress from a specific store; it's often OOS. I poked around the browser Network tab & figured out the URL to hit (& a header value it requires) to automate checking every 5 min. My little Node app stopped working after two weeks. While debugging, I went back to the site manually. Figured the header value timed-out after 15 days or something... I was refreshing and digging in DevTools for minutes, it was definitely not working... all the while I'm failing to notice that the dang thing is in stock. I should be clicking the Buy button, not debugging my little app!