title: How can I cache php generated files on CloudFlare?
body: <p>I want to add to the cloudflare cache jpg and pdf files generated from php pages, with urls in the form of «index.php?file=hola.pdf».
  The files generated are static and everytime the same, but I think there are not being cached because of the php filename extension. </p>
  
  <p>What can I do? What do you suggest?
  Thanks and greets</p>