28_create_http_server.go

package main

import (
	"fmt"
	"net/http"
)

/*
-Go makes it very easy to create a simple HTTP server application.
-This is only a very simple HTTP server that listens for requests and responds
-There is a lot more than this to create a full fledged HTTP server than just
 responding to a single request.
 --You need to add code to handle multiple concurrent requests
 --It needs to deal with HTTP header and parameters and so on
-This only shows how easy it is to work with the web in Go
*/

// this creates a struct type with no fields
type Hello struct{}

// this creates the ServeHTTP method for the type Hello
func (h Hello) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// Fprint function prints to a writer object
	fmt.Fprint(w, "<h1>Hello from the Go web server!!!</h1>")
}

func main() {
	var h Hello
	/*
	   ListenAndServe function accepts the previously declared Hello object
	   as an object and calls the predefined ServeHTTP function to serve for
	   the request
	*/
	err := http.ListenAndServe("localhost:8080", h)
	checkError(err)
}

func checkError(err error) {
	if err != nil {
		panic(err)
	}
}