title: Oauth2 with nodejs
body: <p>I develop a web application with nodeJs. Most of the functions auth protected. I use Oauth2 (Google, Twitter) to authorize users to use the application.</p>
  
  <p>I must create an Android application, what communicate with my backend over http after the user authenticated with Google account in the Android app.</p>
  
  <p>What is the best practice for that?</p>
  
  <p>I think OAuth2 would be good for this job. But how?</p>