"this site has been updated in the background" chrome notification when using php for firebase cloud messaging

Question

I want to send notifications through firebase to users (Web and Mobile) as i am developing a progressive web app.

I have created a project in Firebase by following their tutorial. Everything is working well, and also i tested sending notification using Curl and it works on Computer and Mobile both properly.

curl --header "Content-Type: application/json" \
     --header "Authorization: key=<MY-FIREBASE-SERVER-KEY>" \
     -d '{
           "notification": {
             "title": "New Message",
             "body": "Hello, How are you ?",
             "icon": "/images/profile_placeholder.png",
             "click_action": "http://localhost:5000"
           },
           "to": "MY-CLIENT-FCM-TOKEN"
         }' \
     https://fcm.googleapis.com/fcm/send

It works properly and shows the notification.

But when I use PHP for sending notification then it sends the notification but with the message as "this site has been updated in the background".

Here is the php file: pwa_demo2.php

<?php
// API access key from Google API's Console
define( 'API_ACCESS_KEY', '<MY-FIREBASE-SERVER-KEY>' );

// prep the bundle
$msg = array
(
    'message'   => 'Hello, How are you ?',
    'title'     => 'New Message'

);
$fields = array
(
    'to'    => 'MY-CLIENT-FCM-TOKEN',
    'data'  => $msg
);

$headers = array
(
    'Authorization: key=' . API_ACCESS_KEY,
    'Content-Type: application/json'
);

$ch = curl_init();
curl_setopt( $ch,CURLOPT_URL, 'https://fcm.googleapis.com/fcm/send' );
curl_setopt( $ch,CURLOPT_POST, true );
curl_setopt( $ch,CURLOPT_HTTPHEADER, $headers );
curl_setopt( $ch,CURLOPT_RETURNTRANSFER, true );
curl_setopt( $ch,CURLOPT_SSL_VERIFYHOST, 0);
curl_setopt( $ch,CURLOPT_SSL_VERIFYPEER, false );
curl_setopt( $ch,CURLOPT_POSTFIELDS, json_encode( $fields ) );
$result = curl_exec($ch );

if($result === false)
{
    die('Curl failed: '.curl_error($ch));
}
curl_close( $ch );
echo $result;

?>

So please help me as i am stuck in this for hours...

Answer 1

Your PHP code is not sending the same message as the CURL command line.

Try printing the output of json_encode( $fields ) and check if it's the same as the payload that you are passing to the CURL command line with the -d option