web_print_body.go

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)

func printPost(rw http.ResponseWriter, req *http.Request) {
	body, err := ioutil.ReadAll(req.Body)
	req.Body.Close()
	if err != nil {
		log.Fatal("ReadAll: ", err)
	}
	fmt.Println(string(body))
}

func main() {
	http.HandleFunc("/alerts", printPost)
	if err := http.ListenAndServe(":4000", nil); err != nil {
		log.Fatal("ListenAndServe: ", err)
	}
}