main.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
)

func echoHandler(w http.ResponseWriter, r *http.Request) {
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		http.Error(w, "Unable to read request body", http.StatusInternalServerError)
		return
	}

	response := map[string]interface{}{
		"method": r.Method,
		"url":    r.URL.String(),
		"header": r.Header,
		"body":   string(body),
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(response)
}

func main() {
	port := os.Getenv("HTTP_ECHO_PORT")
	if port == "" {
		port = "8080"
	}
	port = fmt.Sprintf(":%s", port)

	http.HandleFunc("/", echoHandler)

	if err := http.ListenAndServe(port, nil); err != nil {
		log.Fatal("Failed to start server:", err)
	}
}