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webcal scheme was devised for use with the Apple iCal application and has become a common de facto standard for accessing iCalendar formatted files via WebDAV, usually using GET method. It is not an official URI scheme, such as
ftp, as registered with IANA. As of 23 September 2012[update], the webcal scheme has provisional status with IANA. The Webcal protocol prefix is used to trigger an external protocol handler which is passed the URL of the .ics file rather than being passed the downloaded contents of the file, in much the same way
feed is sometimes used to trigger external RSS readers. The idea is that with this protocol prefix the target file should be subscribed to rather than imported into the calendar application as would happen with a simple download.
Notable software packages and web applications supporting the webcal protocol include:
CalDAV and GroupDAV are both efforts to provide WebDAV-based access to calendar stores with finer granularity. The CalDAV Access protocol has been standardized by the IETF and published as RFC 4791. Extensions to CalDAV for automated scheduling are also standardized, as RFC 6638.