What is the difference between HTTPS and HTTP?

HTTPS (HyperText Transfer Protocol Secure) is an extension of HTTP that provides secure data transmission between the client and the server. The main difference between HTTPS and HTTP is that HTTPS uses the TLS/SSL protocol for data encryption, which protects it from interception and tampering.

Key differences:

• Encryption: HTTPS encrypts all traffic, HTTP does not.
• Server authentication: HTTPS uses certificates to verify the server's authenticity.
• Data integrity: HTTPS ensures protection against data modification in transit.

In Go, working with HTTPS is sufficient with the standard net/http package, which automatically supports HTTPS when specifying a URL with https:// and having a valid certificate.

Example of a simple HTTPS server in Go:

package main

import (
    "log"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("Hello, HTTPS!"))
}

func main() {
    http.HandleFunc("/", handler)
    // To run an HTTPS server, you need a certificate and a key
    err := http.ListenAndServeTLS(":443", "server.crt", "server.key", nil)
    if err != nil {
        log.Fatal(err)
    }
}

Thus, HTTPS ensures data security and confidentiality, which HTTP does not provide.