You can add an authentication layer 
<https://cloud.google.com/docs/authentication/> to your application so that 
only a properly authorized client can access your API. One of the most 
popular option is the use of OAuth 2.0. Here is Getting Started with 
Authentication 
<https://cloud.google.com/docs/authentication/getting-started> article or 
this OAuth 2.0 Web Server Applications 
<https://developers.google.com/identity/protocols/OAuth2WebServer> article.

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