<s>
The	O
HTTP	B-Protocol
Location	I-Protocol
header	B-Protocol
field	I-Protocol
is	O
returned	O
in	O
responses	O
from	O
an	O
HTTP	B-Protocol
server	B-Application
under	O
two	O
circumstances	O
:	O
</s>
<s>
In	O
this	O
circumstance	O
,	O
the	O
Location	O
header	O
should	O
be	O
sent	O
with	O
an	O
HTTP	B-Protocol
status	I-Protocol
code	I-Protocol
of	O
3xx	O
.	O
</s>
<s>
It	O
is	O
passed	O
as	O
part	O
of	O
the	O
response	O
by	O
a	O
web	O
server	B-Application
when	O
the	O
requested	O
URI	B-Protocol
has	O
:	O
</s>
<s>
In	O
this	O
circumstance	O
,	O
the	O
Location	O
header	O
should	O
be	O
sent	O
with	O
an	O
HTTP	B-Protocol
status	I-Protocol
code	I-Protocol
of	O
201	O
or	O
202	O
.	O
</s>
<s>
An	O
obsolete	O
version	O
of	O
the	O
HTTP	B-Protocol
1.1	I-Protocol
specifications	O
(	O
IETF	O
RFC	B-Protocol
2616	I-Protocol
)	O
required	O
a	O
complete	O
absolute	O
URI	B-Protocol
for	O
redirection	O
.	O
</s>
<s>
The	O
IETF	O
HTTP	B-Protocol
working	O
group	O
found	O
that	O
the	O
most	O
popular	O
web	O
browsers	O
tolerate	O
the	O
passing	O
of	O
a	O
relative	O
URL	O
and	O
,	O
consequently	O
,	O
the	O
updated	O
HTTP	B-Protocol
1.1	I-Protocol
specifications	O
(	O
IETF	O
RFC	O
7231	O
)	O
relaxed	O
the	O
original	O
constraint	O
,	O
allowing	O
the	O
use	O
of	O
relative	O
URLs	O
in	O
Location	O
headers	O
.	O
</s>
<s>
Absolute	O
URLs	O
are	O
URLs	O
that	O
start	O
with	O
a	O
scheme	O
(	O
e.g.	O
,	O
http:	O
,	O
https	B-Protocol
:	O
,	O
telnet	O
:	O
,	O
mailto	O
:	O
)	O
and	O
conform	O
to	O
scheme-specific	O
syntax	O
and	O
semantics	O
.	O
</s>
<s>
For	O
example	O
,	O
the	O
HTTP	B-Protocol
scheme-specific	O
syntax	O
and	O
semantics	O
for	O
HTTP	B-Protocol
URLs	O
requires	O
a	O
"	O
host	O
"	O
(	O
web	O
server	B-Application
address	O
)	O
and	O
"	O
absolute	O
path	O
"	O
,	O
with	O
optional	O
components	O
of	O
"	O
port	O
"	O
and	O
"	O
query	O
"	O
.	O
</s>
<s>
may	O
get	O
a	O
server	B-Application
response	O
with	O
a	O
path	O
that	O
is	O
absolute	O
because	O
it	O
starts	O
with	O
a	O
slash	O
:	O
</s>
<s>
may	O
get	O
a	O
server	B-Application
response	O
with	O
a	O
path	O
that	O
is	O
relative	O
because	O
it	O
does	O
n't	O
start	O
with	O
a	O
slash	O
:	O
</s>
