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Mastering Go

You're reading from   Mastering Go Create Golang production applications using network libraries, concurrency, machine learning, and advanced data structures

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Product type Paperback
Published in Aug 2019
Publisher Packt
ISBN-13 9781838559335
Length 798 pages
Edition 2nd Edition
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Author (1):
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Mihalis Tsoukalos Mihalis Tsoukalos
Author Profile Icon Mihalis Tsoukalos
Mihalis Tsoukalos
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Table of Contents (15) Chapters Close

1. Go and the Operating System 2. Understanding Go Internals FREE CHAPTER 3. Working with Basic Go Data Types 4. The Uses of Composite Types 5. How to Enhance Go Code with Data Structures 6. What You Might Not Know About Go Packages and Functions 7. Reflection and Interfaces for All Seasons 8. Telling a UNIX System What to Do 9. Concurrency in Go – Goroutines, Channels, and Pipelines 10. Concurrency in Go – Advanced Topics 11. Code Testing, Optimization, and Profiling 12. The Foundations of Network Programming in Go 13. Network Programming – Building Your Own Servers and Clients 14. Machine Learning in Go 15. Other Books You May Enjoy

Creating a web client in Go

In this section, you will learn more about developing web clients in Go. The name of the web client utility is webClient.go, and it is going to be presented in four parts.

The first part of webClient.go contains the following Go code:

package main 
 
import ( 
    "fmt" 
    "io" 
    "net/http" 
    "os" 
    "path/filepath" 
) 

The second part of webClient.go is where you read the desired URL as a command-line argument:

func main() { 
    if len(os.Args) != 2 { 
        fmt.Printf("Usage: %s URL\n", filepath.Base(os.Args[0])) 
        return 
    } 
 
    URL := os.Args[1] 

The third code portion of webClient.go is where the real action takes place:

    data, err := http.Get(URL) 
 
    if err != nil { 
        fmt.Println(err) 
        return 

All of the work is done by the http.Get() call...

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