Details
Description
The UID field at this link has two flaws.
1)The hex string changes when you refresh it meaning that there is not a consistant unique identifier for the event (important for differentiating between new events and updates to old ones)
eg this
UID:CiviCRM_EventID_5_043b53270d5921776ec8b4a22f486d13@http://sandbox.civicrm.org/
refreshes to
UID:CiviCRM_EventID_5_b90393be7a6f8aa750d33c516e77ee59@http://sandbox.civicrm.org/
2) the https://sandbox.civicrm.org should be replaced with sandbox.civicrm.org
In particular the single slash at the end is problematic in some instances as it acts as an escape
http://sandbox.civicrm.org/civicrm/event/ical?reset=1&page=1