Serve HTTP 200 to any incoming request and print path, method and request body.

srv200.go

package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"net/http"
	"strconv"
)

func main() {
	port := flag.Int("port", 9000, "port to listen on")
	flag.Parse()

	http.HandleFunc("/", handler)
	http.ListenAndServe(":" + strconv.Itoa(*port), nil)
}

func handler(w http.ResponseWriter, r *http.Request) {
	w.WriteHeader(200)
	b, _ := ioutil.ReadAll(r.Body)
	if len(b) > 0 {
		b = append(b, '\n')
	}
	fmt.Printf("%s %s\n%s\n", r.Method, r.URL.Path, string(b))
}