Golang Cheat Sheet

package main

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

// content holds the static content (2 files) or the web server.
//go:embed a.txt b.txt
var content embed.FS

func main() {
    http.Handle("/", http.FileServer(http.FS(content)))
    log.Fatal(http.ListenAndServe(":8080", nil))
}

package main

import (
    "fmt"
    "net/http"
)

// define a type for the response
type Hello struct{}

// let that type implement the ServeHTTP method (defined in interface http.Handler)
func (h Hello) ServeHTTP(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, "Hello!")
}

func main() {
    var h Hello
    http.ListenAndServe("localhost:4000", h)
}

// Here's the method signature of http.ServeHTTP:
// type Handler interface {
//     ServeHTTP(w http.ResponseWriter, r *http.Request)
// }