portainer-example/main.go

package main

import (
	"encoding/json"
	"log"
	"mime"
	"net/http"
)

func main() {
	r := http.NewServeMux()
	r.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		if r.Method != http.MethodGet {
			http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
			return
		}

		w.Header().Set("Content-Type", mime.TypeByExtension(".json"))
		if err := json.NewEncoder(w).Encode("ok"); err != nil {
			log.Fatal(err)
			return
		}
	})

	log.Printf(`Starting server on :4000...`)
	log.Fatal(http.ListenAndServe(":4000", r))
}