How to create a custom HTTP server with routing and request handling in Go?

To create a custom HTTP server with routing and request handling in Go, you can use the net/http package. Below is an example of how you can achieve this:

Import the required packages:

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

Define a handler function for each route that you want to handle:

func homeHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Welcome to the Home Page!")
}

func aboutHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "This is the About Page!")
}

Create a router function that maps each route to its respective handler:

func router() *http.ServeMux {
	mux := http.NewServeMux()

	mux.HandleFunc("/", homeHandler)
	mux.HandleFunc("/about", aboutHandler)

	return mux
}

Create a main function that starts the server and listens on a specified port:

func main() {
	server := &http.Server{
		Addr:    ":8080",
		Handler: router(),
	}

	log.Println("Server started on http://localhost:8080")
	log.Fatal(server.ListenAndServe())
}

Run the main function to start the server.

Now, when you access http://localhost:8080, you will see the "Welcome to the Home Page!" message, and when you access http://localhost:8080/about, you will see the "This is the About Page!" message.

This example demonstrates the basic setup for creating a custom HTTP server with routing and request handling in Go. You can expand on this by adding more routes and handlers as per your requirements.