Google Cloud Messaging for application servers implemented using the Go programming language.
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Getting Started

To install gcm, use go get:

go get

Import gcm with the following:

import ""

Sample Usage

Here is a quick sample illustrating how to send a message to the GCM server:

package main

import (


func main() {
	// Create the message to be sent.
	data := map[string]interface{}{"score": "5x1", "time": "15:10"}
	regIDs := []string{"4", "8", "15", "16", "23", "42"}
	msg := gcm.NewMessage(data, regIDs...)

	// Create a Sender to send the message.
	sender := &gcm.Sender{ApiKey: "sample_api_key"}

	// Send the message and receive the response after at most two retries.
	response, err := sender.Send(msg, 2)
	if err != nil {
		fmt.Println("Failed to send message:", err)

	/* ... */

Note for Google AppEngine users

If your application server runs on Google AppEngine, you must import the appengine/urlfetch package and create the Sender as follows:

package sample

import (


func handler(w http.ResponseWriter, r *http.Request) {
	c := appengine.NewContext(r)
	client := urlfetch.Client(c)
	sender := &gcm.Sender{ApiKey: "sample_api_key", Http: client}

	/* ... */