rusty-pipe/src/testdata/http.go

package main

import (
	"net/http"
	"os"
)

func main() {
	p := os.Getenv("PORT")
	if err := http.ListenAndServe(":"+p, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte(os.Getenv("BODY")))
	})); err != nil {
		panic(err)
	}
}