Go Web Application Handle HandleFunc

http

Go supports web application development by default

“net/http” package contains http support.

Handle, HandleFunc

To receive and handle http request, http has 2 methods

Handle : Take ServeHTTP implement

HandleFunc : Take support method

Anyway, it’s better to take a look codes

Sample

|- web
|   |- getstartedweb.go
|- main.go

getstartedweb.go

Create struct and implement ServeHTTP methods under struct

package web

import "net/http"

type StartHandler struct {
	Message string
}

func (f *StartHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	w.Write([]byte(f.Message))
}

ServeHTTP has ResponseWriter, and Request.

Create StartHandler with message.

StartHandler is public to out side

main.go

Create StartHandler under web package.

Import this and use it.

Also at the same time, we will use HandleFunc

package main

import (
	"fmt"
	"net/http"
	"github.com/DJ110/gorefs/web"
)

func main() {
        http.Handle("/main", &(web.StartHandler{Message: "Hello Web"}))

	webfunc := func(w http.ResponseWriter, _ *http.Request) {
	      w.Write([]byte("Hello Web2"))
	}
        http.HandleFunc("/main2", webfunc)

	err := http.ListenAndServe(":8080", nil)
	if err != nil {
	      log.Fatal(err)
	}
}

There are 2 endpoint, /main and /main2

Handle uses ServeHTTP implement pointer, HandleFunc takes function.

ListenAndServe starts golang server with 8080 port.