title: Google Calendar API - Public calendar not found 404 Error
body: <p>My Android Application  reads shared calendar (public calendar). It worked six months without problems.</p>
  
  <p>From two week, users (guest) receive 404 Not Found Error.
  Owner's calendar use the app without any problems.</p>
  
  <p>So i think that property of sharing are changed. Any ideas?</p>
  
  <p>Also, how can get more info about 404 - Not found error?</p>
  
  <p>App is this --> <a href="https://play.google.com/store/apps/details?id=airbookingapp.hairbooking" rel="nofollow noreferrer">https://play.google.com/store/apps/details?id=airbookingapp.hairbooking</a></p>
  
  <p>It's only in italian but if you selct "Only for debug" salon you can get the error!</p>