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Are there security issues with AJAX?

  •  JavaScript is in plain view to the user with by selecting view source of the page. JavaScript cannot access the local file system without the user's permission. 
  •  An AJAX interaction can only be achieved with the servers-side component from which the page is loaded. 
  •  A proxy pattern can be used for AJAX interactions with external services. 
  •  We should take care that the application model is not exposed in such a way that our server-side components are at risk if a user to reverse engineer your application. 
  •  Like any other web application we should use HTTPS to secure the connection when sensitive information is being exchanged.