Neda Divbandi fxproxy challenge i used https://github.com/traefik/whoami to create downstream a tiny Go webserver
With Docker:
$ docker build -t fxproxy .
$ docker run -it --rm -p 8080:8080 -e PORT=':8080' -e SCHEMA='http' -e DOWNSTREAM='localhost
:49153' fxproxy
go test ./...