title: Appending query string to all .js and .css files to prevent caching?
body: <p>Going thru a tutorial on building a web app and it has been recommended to ALWAYS append a query string "?v=1" to all .css and .js files to prevent caching.</p>
  
  <p>Is this a 'best practice'?</p>
  
  <p>Should the query string only be used during production-development?</p>