title: How do I identify two requests from the same source in NodeJS?
body: <p>my case is simple:</p>
  
  <p>I need an application layer solution to identify and then apply some sort of rule to requests coming from the same origin.</p>
  
  <p>If a guy will request my server from Postman, or from a browser or from a cURL I want to identify this guy and then do something with this information.</p>
  
  <p>In my particular case I want to blacklist a guy who would be attacking my server for sometime.</p>
  
  <p>Is it possible in Node/Express?</p>