prog_04.go

package main

import (
	"fmt"
	"net/http"
	"time"
)

func main() {
	// Create a new transport
	transport := &http.Transport{
		MaxIdleConns:        1,
		MaxIdleConnsPerHost: 1,
		IdleConnTimeout:     30 * time.Second,
	}
	
	// Create a new client with transport
	client := &http.Client{Transport: transport, Timeout: 5 * time.Second}
	defer client.CloseIdleConnections()

	// Create a new HTTP request
	req, err := http.NewRequest("GET", "https://httpbin.org/get", nil)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Attach headers to the request
	req.Header.Add("User-Agent", "go-http-client")
	req.Header.Add("Content-Type", "application/json")

	// Send the request using client
	resp, err := client.Do(req)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println(resp.StatusCode)
}