A dumb little HTTP server to print headers easily using a tabwriter.

main.go

package main

import (
	"fmt"
	"log"
	"net/http"
	"os"
	"strings"
	"text/tabwriter"
)

func main() {
	addr := os.Getenv("ADDR")

	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		tabber := tabwriter.NewWriter(w, 2, 2, 1, ' ', 0)

		fmt.Fprintf(tabber, "PATH\t%s\n", req.URL.Path)
		fmt.Fprintf(tabber, "METHOD\t%s\n", req.Method)

		for key, values := range req.Header {
			fmt.Fprintf(tabber, "%s\t%s\n", key, strings.Join(values, ", "))
		}

		tabber.Flush()
	})

	log.Println("Starting server")
	if err := http.ListenAndServe(addr, http.DefaultServeMux); err != nil {
		log.Fatal(err.Error())
	}
}