trigger retries by responding with a retryable status code

retrigger_retry.go

package main

import (
	"log"
	"net/http"
)

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		log.Println("got request")

		w.WriteHeader(http.StatusServiceUnavailable)
		w.Write([]byte("error"))
	})

	log.Fatal(http.ListenAndServe(":9200", nil))
}