The net/http package in Go provides a rich set of functionalities for working with HTTP. It includes tools for building both servers and clients, making it a versatile package for a wide range of web-related tasks.

Setting Up a Simple HTTP Server

Lets understand the previous example.

package main
import (

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

	http.ListenAndServe(":8080", nil)

This program sets up a server that listens on port 8080 and responds with “Hello, World!” for any request to the root (”/”) path.

Handling HTTP Requests

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

The http.HandleFunc function is used to define how the server responds to specific routes. The provided function takes two parameters: http.ResponseWriter and *http.Request. The response writer is used to send the response back to the client, and the request contains information about the incoming request.

Starting Server

http.ListenAndServe(":80", nil)

This line starts the HTTP server. It listens on port 8080, and the nil argument means that it will use the default ServeMux (multiplexer) provided by the http package. The server will handle incoming HTTP requests based on the registered handlers.

Working with Query Parameters

You can easily handle query parameters using the r.URL.Query() method. Let’s modify our server to greet a user based on a provided name parameter:

func main() {
	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
		name := r.URL.Query().Get("name")
		if name == "" {
			name = "Guest"
		fmt.Fprintf(w, "Hello, %s!", name)

	// ... rest of the code

Now, you can visit http://localhost:8080/?name=John and the server will respond with “Hello, John!”

Serving Static Files

staticDir := http.Dir("./static")
fileServer := http.FileServer(staticDir)
http.Handle("/static/", http.StripPrefix("/static/", fileServer))

Create a ‘static’ folder alongside your main.go file and add any static files like HTML, CSS and JavaScript. For example, you created ‘hello.html’ inside ‘static’ folder.

Now, when you visit http://localhost:8080/static/hello.html, you will be able to see your HTML served.


The http.Dir is a function that converts a string (representing a directory path) into a type that implements the http.FileSystem interface.

The http.FileServer is used to serve static files in the directory.

The http.StripPrefix function is used to remove the “/static/” prefix from the request URL before passing it to the file server. This is useful to avoid exposing the actual directory structure in the URL.