HTTPS Server

To create an HTTPS server program in Go, you need to create a few files: main.go for the main logic and optionally, a server.go file for the server functionality. Here is a step-by-step guide:

Step 1: Initialize the Go Module

First, create a new directory for your project and initialize the Go module.

mkdir httpsserver
cd httpsserver
go mod init github.com/username/httpsserver

Step 2: Create the `server.go` File

Create a server.go file to handle the HTTPS server functionality.

// server.go
package main

import (
    "fmt"
    "net/http"
)

// handler is a simple HTTP handler function.
func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintf(w, "Hello, HTTPS World!")
}

// StartServer starts the HTTPS server on the specified port.
func StartServer(port, certFile, keyFile string) error {
    http.HandleFunc("/", handler)
    return http.ListenAndServeTLS(":"+port, certFile, keyFile, nil)
}

Step 3: Create the `main.go` File

Create a main.go file to use the server functionality.

// main.go
package main

import (
    "fmt"
    "os"
)

func main() {
    if len(os.Args) != 4 {
        fmt.Println("Usage: httpsserver <port> <certFile> <keyFile>")
        os.Exit(1)
    }

    port := os.Args[1]
    certFile := os.Args[2]
    keyFile := os.Args[3]
    fmt.Printf("Starting server on port %s...\n", port)
    if err := StartServer(port, certFile, keyFile); err != nil {
        fmt.Printf("Server failed: %v\n", err)
        os.Exit(1)
    }
}

Step 4: Generate SSL Certificates

You need SSL certificates to run this server. You can generate self-signed certificates using OpenSSL:

openssl req -x509 -newkey rsa:4096 -keyout key.pem -out cert.pem -days 365 -nodes -subj "/C=SE/ST=Skåne/L=Malmö/O=Example/OU=Development/CN=example.com"

Step 5: Run the Program

Run the program using the go run command.

go run main.go 8080 cert.pem key.pem

This will start the HTTPS server on port 8080. You can access it by navigating to https://localhost:8080 in your web browser.

Last modified: 01 January 2025