title: Configure Paypal Sandbox ReturnURL with localhost
body: <p>I'm trying to insert <a href="http://localhost:4000/api/myroute" rel="nofollow">http://localhost:4000/api/myroute</a> as returlURL
  on <a href="https://developer.paypal.com" rel="nofollow">https://developer.paypal.com</a>.</p>
  
  <p>Paypal displays this message :
  We are sorry something went wrong while saving application please try again...</p>
  
  <p>So, localhost seems be forbidden but the last week, it's was ok.</p>
  
  <p>How can i enter localhost url ? </p>
  
  <p>Please, do not answer me the 127.0.0.1 solution.</p>