It's a fast kestrel server to inform your public IP address
git clone https://github.com/jefersonsv/getip
dotnet rungit clone https://github.com/jefersonsv/getip
cd getip/src
sudo docker build -t getip .
sudo docker run --name getip -d -p 4020:5000 --rm getipcurl 'http://localhost:4020'