Hello World

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The typical way to begin writing web servers in Go is to use the standard library net/http module.

There is also a tutorial for it here.

The following code also uses it. Here is the simplest possible HTTP server implementation. It responds "Hello World" to any HTTP request.

Save the following code in a server.go file in your workspaces.

package main

import (

func main() {
    // All URLs will be handled by this function
    // http.HandleFunc uses the DefaultServeMux
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
        w.Write([]byte("Hello, world!"))

    // Continue to process new requests until an error occurs
    log.Fatal(http.ListenAndServe(":8080", nil))

You can run the server using:

$ go run server.go

Or you can compile and run.

$ go build server.go
$ ./server

The server will listen to the specified port (:8080). You can test it with any HTTP client. Here’s an example with cURL:

curl -i http://localhost:8080/
HTTP/1.1 200 OK
Date: Wed, 20 Jul 2016 18:04:46 GMT
Content-Length: 13
Content-Type: text/plain; charset=utf-8

Hello, world!

Press Ctrl+C to stop the process.

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