Making a Calendar public via the ACL feed

Google Calendar allows individual calendars to be marked as public, meaning that they can be accessed either via the Calendar UI, embeded calendars, or the Calendar Data API without requiring a password.

Normally, this option is enabled from within the Calendar UI. However, it can be enabled using the Calendar Data API as well. To do so, you'd send the following HTTP request:

POST /calendar/feeds/default/acl/full
Host: www.google.com


  
  
  

In this case, this will make the default calendar as public. If you want to make a secondary calendar public, replace default in the request's location with the desired calendar ID.