main.go

package main

import (
    "fmt"
	"net"
    "net/http"
	"os"
	"log"
)

func hello(w http.ResponseWriter, req *http.Request) {
    fmt.Fprintf(w, "hell theno\n")
}

func headers(w http.ResponseWriter, req *http.Request) {
    for name, headers := range req.Header {
        for _, h := range headers {
            fmt.Fprintf(w, "%v: %v\n", name, h)
        }
    }
}

func main() {
	port := "8080"
	if val, ok := os.LookupEnv("PORT"); ok {
		port = val
	}

    http.HandleFunc("/hello", hello)
    http.HandleFunc("/headers", headers)

	listener, err := net.Listen("tcp", "0.0.0.0:"+port)
    if err != nil {
        log.Fatal(err)
    }

	// Log server started
	log.Printf("Server started at port %v", listener.Addr().(*net.TCPAddr).Port)
    panic(http.Serve(listener, nil))
}