Explore how to build web applications in Go

Writing web applications in Go has become an increasingly popular practice. Go is an efficient programming language that can be used to build fast, reliable, and secure web applications. In this article, we will explore how to build web applications in Go, focusing on how to deploy them.

1. Start

Before you start, you need to prepare the following points:

• Go environment is installed.
• The editor of your choice is installed.
• Understand some basic knowledge of HTTP protocol and Web applications.

2. Writing a Web Application

We will start with a simple "Hello World" web application. Create a new file in your editor and copy-paste the following code:

package main

import (
    "fmt"
    "net/http"
)

func main() {
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        fmt.Fprintf(w, "Hello, World!")
    })

    http.ListenAndServe(":8080", nil)
}

This simple web application listens on port 8080 and returns "Hello, World!". Run the web application by running the following command:

$ go run main.go

3. Build Web Application

After you finish writing the code, you need to compile it into an executable file , and deploy it to relevant platforms. We can build our application using Go's built-in tools:

$ go build -o main

This command will compile our application into an executable named "main". Now, we can run the program:

$ ./main

The application should now start running. However, we need to deploy it to a real web server so that more people can access it through browsers.

4. Deploy Web Application

Before deploying, we need to ensure that our server has the Go environment installed. This can be checked by running the following command on the server:

$ go version

If you see the version number, you have successfully installed the Go environment. Next, we need to copy our executable file to the server. You can transfer files to a remote server using the scp command:

$ scp main user@remote:/path/to/destination

This will transfer our executable file to the specified path on the remote server.

Now, we need to run the application on the server. To do this, we can use the nohup command, which runs the application in the background:

$ nohup /path/to/destination/main &

The application should now be running on the server. You can use your browser to access the server's IP address and port number to see if your web application is working properly.

Summary

In this article, we have introduced how to write web applications using Go and demonstrated how to deploy the application. In fact, deployment may also involve some other steps, such as using a web server such as Nginx or Apache, or using a deployment method such as a Docker container. However, the basics covered in this article should be enough for beginners.

If you are looking for more information about building web applications with Go, it is recommended that you check out the Go official documentation or refer to some Go web frameworks, such as Gin or Echo, etc.

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