Minimal http server connected with database

main.go

package main

import (
	"database/sql"
	"fmt"
	"log"
	"net/http"

	// pq is postgres driver for database/sql
	_ "github.com/lib/pq"
)

func main() {

	db, err := sql.Open("postgres", fmt.Sprintf(
		"user=%s password=%s dbname=%s host=%s sslmode=%s port=%d",
		"postgres", "postgres", "postgres", "localhost", "disable", 5432))
	if err != nil {
		log.Fatal(err)
	}

	router := http.NewServeMux()

	router.HandleFunc("/probes/readiness", func(res http.ResponseWriter, req *http.Request) {
		if err := db.PingContext(req.Context()); err != nil {
			res.WriteHeader(503)
		}
	})

	srv := &http.Server{
		Handler: router,
		Addr:    fmt.Sprintf(":%s", "8081"),
	}
	log.Fatal(srv.ListenAndServe())

}