title: Create a secret url using spring boot
body: <p>I'm studying different technologies to create an API for a multi plateform application. This application has to give the possibility to users to share a file with a friend without authentication, but the URL has to be unguessable so the file keep secret. Juste like sharing picture feature in google photos.</p>
  
  <p>Spring boot is one of the most interesting framework to create a multi plateform API, but I'm wondering if it's possible to create a secret and unguessable URL.</p>
  
  <p>Thank you for your time.</p>