This is a reverse proxy that specifically supports emoji subdomains for nftnft.lol which is a Yat-esque service built on web3 by Owen of 0xmons.
Previously, nftnft.lol was using path-based routing for redirection and required the user to have a web3 connection. Using my 🌈 record as an example, it looked like this: nftnft.lol/#/a/🌈
By including this proxy, it now supports subdomain-based routing for redirection and the web3 connectivity is offloaded to the proxy. Users can now use records like this: 🌈.nftnft.lol
TLDR this proxy let's users do 🌈.nftnft.lol instead of nftnft.lol/#/a/🌈
The proxy is a simple Node app that is running in Heroku with a keepalive from Kaffine.
When the proxy receives a request to nftnft.lol with a subdomain, it asks the contract if a redirect has been set and then forwards the request either to the set value or to the nftnft.lol homepage.