When trying to import a calendar using a URL to an ICS file (not a script that generates an iCal data), the import process throws an error.

1. Log in to Moodle as a student
2. Go to Navigation > Site pages > Calendar.
3. Click the button 'Manage subscriptions'.
4. Try importing a calendar with the URL http://tinyurl.com/at55c97

Expected result: The file should be used as the basis of a calendar

Actual result: An error is shown, but the calendar entry is still created.

The given iCal URL is invalid.

More information about this error

Debug info:

Error code: errorinvalidicalurl

Stack trace:

    line 2873 of /calendar/lib.php: moodle_exception thrown

    line 2950 of /calendar/lib.php: call to calendar_get_icalendar()

    line 78 of /calendar/managesubscriptions.php: call to calendar_update_subscription_events()

I suspect this has something to do with the call to $curl->get() failing at line 2871 of calendar/lib.php. This might be because the URL of the calendar above forces the user to download the file, rather than giving the content as a response. Trying the following URL works. Using the URLs directly in your browser highlights this distinction.

http://www.mozilla.org/projects/calendar/caldata/AustraliaHolidays.ics