<s>
Webcal	B-Protocol
is	O
a	O
uniform	B-Protocol
resource	I-Protocol
identifier	I-Protocol
(	O
URI	B-Protocol
)	O
scheme	O
for	O
accessing	O
iCalendar	O
files	O
.	O
</s>
<s>
WebCal	B-Protocol
allows	O
you	O
to	O
create	O
and	O
maintain	O
an	O
interactive	O
events	O
calendar	B-Operating_System
or	O
scheduling	O
system	O
on	O
a	O
Web	O
site	O
or	O
app	O
.	O
</s>
<s>
The	O
webcal	B-Protocol
scheme	O
was	O
devised	O
for	O
use	O
with	O
the	O
Apple	B-Operating_System
iCal	I-Operating_System
application	O
and	O
has	O
become	O
a	O
common	O
de	O
facto	O
standard	O
for	O
accessing	O
iCalendar	O
formatted	O
files	O
via	O
WebDAV	B-Protocol
,	O
usually	O
using	O
GET	O
method	O
.	O
</s>
<s>
It	O
is	O
not	O
an	O
official	O
URI	B-Protocol
scheme	O
,	O
such	O
as	O
http	B-Protocol
and	O
ftp	O
,	O
as	O
registered	O
with	O
IANA	O
.	O
</s>
<s>
,	O
the	O
webcal	B-Protocol
scheme	O
has	O
provisional	O
status	O
with	O
IANA	O
.	O
</s>
<s>
The	O
Webcal	B-Protocol
protocol	O
prefix	O
is	O
used	O
to	O
trigger	O
an	O
external	O
protocol	O
handler	O
which	O
is	O
passed	O
the	O
URL	O
of	O
the	O
.ics	O
file	O
rather	O
than	O
being	O
passed	O
the	O
downloaded	O
contents	O
of	O
the	O
file	O
,	O
in	O
much	O
the	O
same	O
way	O
feed	O
is	O
sometimes	O
used	O
to	O
trigger	O
external	O
RSS	B-Application
readers	I-Application
.	O
</s>
<s>
The	O
idea	O
is	O
that	O
with	O
this	O
protocol	O
prefix	O
the	O
target	O
file	O
should	O
be	O
subscribed	O
to	O
rather	O
than	O
imported	O
into	O
the	O
calendar	B-Operating_System
application	O
as	O
would	O
happen	O
with	O
a	O
simple	O
download	O
.	O
</s>
<s>
Notable	O
software	O
packages	O
and	O
web	O
applications	O
supporting	O
the	O
webcal	B-Protocol
protocol	O
include	O
:	O
</s>
<s>
CalDAV	B-Protocol
and	O
GroupDAV	O
are	O
both	O
efforts	O
to	O
provide	O
WebDAV-based	O
access	O
to	O
calendar	B-Operating_System
stores	O
with	O
finer	O
granularity	O
.	O
</s>
<s>
The	O
CalDAV	B-Protocol
Access	O
protocol	O
has	O
been	O
standardized	O
by	O
the	O
IETF	O
and	O
published	O
as	O
RFC	O
4791	O
.	O
</s>
<s>
Extensions	O
to	O
CalDAV	B-Protocol
for	O
automated	O
scheduling	O
are	O
also	O
standardized	O
,	O
as	O
RFC	O
6638	O
.	O
</s>
<s>
Neither	O
of	O
those	O
protocols	O
call	O
for	O
using	O
DAV	B-Protocol
style	O
URIs	B-Protocol
.	O
</s>
<s>
Instead	O
,	O
both	O
drafts	O
call	O
for	O
using	O
the	O
HTTP	B-Protocol
OPTIONS	O
feature	O
to	O
return	O
that	O
the	O
server	O
supports	O
calendaring	O
extensions	O
.	O
</s>
