<s>
Google	B-Protocol
Web	I-Protocol
Server	I-Protocol
(	O
GWS	O
)	O
is	O
proprietary	O
web	B-Application
server	I-Application
software	O
that	O
Google	B-Application
uses	O
for	O
its	O
web	O
infrastructure	O
.	O
</s>
<s>
GWS	O
is	O
used	O
exclusively	O
inside	O
Google	B-Application
's	I-Application
ecosystem	O
for	O
website	O
hosting	O
.	O
</s>
<s>
GWS	O
is	O
sometimes	O
described	O
as	O
one	O
of	O
the	O
most	O
guarded	O
components	O
of	O
Google	B-Application
's	I-Application
infrastructure	O
.	O
</s>
<s>
In	O
May	O
,	O
2015	O
,	O
GWS	O
was	O
ranked	O
as	O
the	O
fourth	O
most	O
popular	O
web	B-Application
server	I-Application
on	O
the	O
internet	O
after	O
Apache	B-Application
,	O
nginx	B-Operating_System
and	O
Microsoft	B-Application
IIS	I-Application
,	O
powering	O
an	O
estimated	O
7.95	O
%	O
of	O
active	O
websites	O
.	O
</s>
<s>
Web	O
page	O
requests	O
on	O
most	O
Google	B-Application
pages	O
provide	O
"	O
gws	O
"	O
(	O
without	O
a	O
version	O
number	O
)	O
in	O
the	O
HTTP	B-Protocol
header	I-Protocol
as	O
an	O
indication	O
of	O
the	O
web	B-Application
server	I-Application
software	O
being	O
used	O
.	O
</s>
<s>
In	O
a	O
blog	O
post	O
from	O
Google	B-Application
's	I-Application
Chicago	O
office	O
in	O
2011	O
,	O
Google	B-Application
provided	O
some	O
details	O
on	O
GWS	O
:	O
</s>
