mux: Hello World application

Step 1: Install mux package by executing below command.

go get -u github.com/gorilla/mux

Step 2: Create App.go with below content.

App.go

package main

import (
 "net/http"

 "github.com/gorilla/mux"
)

func main() {
 router := mux.NewRouter()
 router.HandleFunc("/", HomePageHandler)

 http.Handle("/", router)
 http.ListenAndServe(":8080", nil)
}

// HomePageHandler send Hello World message to the client
func HomePageHandler(w http.ResponseWriter, r *http.Request) {
 w.Header().Set("Content-Type", "text/html")

 dataToWrite := []byte("Hello World")
 w.Write(dataToWrite)
}

Run App.go and open the url ‘http://localhost:8080/’ in browser, you can see below screen.

router := mux.NewRouter()

Above statement gets new router instance. Router is responsible to send given request to corresponding http handler.

router.HandleFunc("/", HomePageHandler)

Above statement maps the home page to HomePageHandler function. 'HomePageHandler' handler function implemented like below.

func HomePageHandler(w http.ResponseWriter, r *http.Request) {

         w.Header().Set("Content-Type", "text/html")

         dataToWrite := []byte("Hello World")

         w.Write(dataToWrite)

}

http.Handle("/", router)

Above statement register all the requests to the given router.

http.ListenAndServe(":8080", nil)

Above statement makes the http application to listen on port 8080.

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