Googlecloudmessaging Unauthorized Error 401

I try to create project with use GoogleCloudMessaging to recieve push - notifications from my remote server. For client i use google tutorial Implementing GCM Client. For server

Solution 1:

To create the new server key, follow the steps,

• Go to https://cloud.google.com/console/project
• Click your Project
• Go to APIs & auth on Left Panel
• Select Credentials in submenu on Left Panel
• Under Public API access, click on "Create New Key"
• Choose 'Server'
• On next dialog, Specify the whitelisted IPs, if you have any. Leaving it blank, the requests will be from any IP
• Click Create.
• You will find the new server key is created under "Public API Access"

This key is to be used for sending message in your script on server side.