I'm trying to deploy my NodeJS application to Zeit. I've followed this (https://github.com/DevMountain/Hosting-React-Zeit) instruction and after npm run deploy I'm getting "Invalid Host header" error. I saw other (https://stackoverflow.com/questions/52814519/invalid-host-header-in-a-react-app-deployed-to-ibm-cloud) instructions, but they're using different stack on technologies, so I can't really apply it to my situation. The only answer (https://zeit.co/vpicone/portfolio/ppiiegssbe/source?f=README.md) I've found is about the same issue with proxy, and to fix it they want to create .env.development file and put there HOST=mypublicdevhost.com. So, my question is what is HOST here or is there any other way to fix it? Right now status of my app is "READY".