Go HTTP Client | Golang Programming Tutorials

Introduction

This lab aims to test your ability to use the net/http package in Golang to issue HTTP requests.

HTTP Client

You are required to write a program that sends an HTTP GET request to a server and prints the HTTP response status and the first 5 lines of the response body.

The program should use the net/http package to issue an HTTP GET request.
The program should print the HTTP response status.
The program should print the first 5 lines of the response body.
The program should handle errors gracefully.

$ go run http-clients.go
Response status: 200 OK
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>Go by Example</title>

There is the full code below:

// The Go standard library comes with excellent support
// for HTTP clients and servers in the `net/http`
// package. In this example we'll use it to issue simple
// HTTP requests.
package main

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

func main() {

    // Issue an HTTP GET request to a server. `http.Get` is a
    // convenient shortcut around creating an `http.Client`
    // object and calling its `Get` method; it uses the
    // `http.DefaultClient` object which has useful default
    // settings.
    resp, err := http.Get("https://gobyexample.com")
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()

    // Print the HTTP response status.
    fmt.Println("Response status:", resp.Status)

    // Print the first 5 lines of the response body.
    scanner := bufio.NewScanner(resp.Body)
    for i := 0; scanner.Scan() && i < 5; i++ {
        fmt.Println(scanner.Text())
    }

    if err := scanner.Err(); err != nil {
        panic(err)
    }
}

Summary

In this lab, you have learned how to use the net/http package in Golang to issue HTTP requests and handle errors.

Golang HTTP Request Handling

Introduction

HTTP Client

Summary