<s>
Zeus	B-Protocol
Web	I-Protocol
Server	I-Protocol
is	O
a	O
discontinued	O
proprietary	B-Application
high-performance	O
web	B-Application
server	I-Application
for	O
Unix	B-Application
and	O
Unix-like	B-Operating_System
platforms	O
(	O
including	O
Solaris	B-Application
,	O
FreeBSD	B-Operating_System
,	O
HP-UX	B-Application
and	O
Linux	B-Application
)	O
.	O
</s>
<s>
Zeus	O
was	O
designed	O
to	O
be	O
a	O
high-performance	O
web	B-Application
server	I-Application
since	O
the	O
beginning	O
of	O
its	O
development	O
(	O
1995	O
)	O
and	O
since	O
a	O
few	O
years	O
later	O
till	O
the	O
first	O
decade	O
of	O
2000s	O
it	O
was	O
known	O
as	O
one	O
of	O
the	O
fastest	O
and	O
most	O
scalable	O
web	B-Application
servers	I-Application
available	O
on	O
market	O
.	O
</s>
<s>
Despite	O
its	O
excellent	O
performance	O
,	O
it	O
never	O
gained	O
more	O
than	O
a	O
few	O
percentage	O
points	O
(	O
less	O
than	O
3%	O
)	O
in	O
the	O
global	O
usage	O
of	O
most	O
popular	O
web	B-Application
servers	I-Application
.	O
</s>
<s>
However	O
,	O
it	O
was	O
commonly	O
used	O
by	O
hardware	B-Architecture
vendors	O
submitting	O
SPECweb99	O
benchmarks	O
for	O
their	O
hardware	B-Architecture
.	O
</s>
<s>
While	O
some	O
SPECweb2005	O
submissions	O
were	O
made	O
using	O
Zeus	O
,	O
by	O
2008	O
it	O
was	O
no	O
longer	O
used	O
by	O
the	O
top	O
computer	B-Architecture
hardware	I-Architecture
performers	O
.	O
</s>
<s>
Support	O
for	O
AIX	B-Application
,	O
Tru64	B-Operating_System
,	O
and	O
Mac	B-Application
OS	I-Application
X	I-Application
was	O
dropped	O
on	O
10	O
June	O
2008	O
.	O
</s>
<s>
In	O
addition	O
to	O
static	O
content	O
serving	O
,	O
Zeus	O
supported	O
dynamic	O
content	O
via	O
CGI	B-Language
,	O
FastCGI	O
,	O
Apache	B-Application
JServ	I-Application
,	O
ISAPI	B-Library
,	O
NSAPI	B-Application
,	O
mod_perl	O
,	O
SSI	O
and	O
Zeus	O
Distributed	O
Authentication	O
and	O
Content	O
(	O
ZDAC	O
)	O
,	O
a	O
proprietary	B-Application
FastCGI-like	O
protocol	O
.	O
</s>
<s>
While	O
Zeus	O
mainly	O
competed	O
with	O
other	O
commercial	O
web	B-Application
servers	I-Application
such	O
as	O
Oracle	B-Language
iPlanet	I-Language
Web	I-Language
Server	I-Language
,	O
it	O
also	O
included	O
a	O
high	O
degree	O
of	O
compatibility	O
with	O
Apache	B-Application
HTTP	I-Application
Server	I-Application
(	O
including	O
.htaccess	B-Protocol
support	O
and	O
a	O
URL	B-Protocol
rewriting	I-Protocol
system	O
comparable	O
to	O
Apache	B-Application
's	O
mod_rewrite	O
)	O
,	O
with	O
the	O
expectation	O
that	O
Apache	B-Application
users	O
would	O
migrate	O
to	O
Zeus	O
as	O
their	O
server	O
load	O
increased	O
.	O
</s>
<s>
NSAPI	B-Application
and	O
ISAPI	B-Library
were	O
added	O
to	O
ease	O
migrations	O
from	O
Microsoft	B-Application
IIS	I-Application
and	O
Sun	B-Language
Java	I-Language
System	I-Language
Web	I-Language
Server	I-Language
.	O
</s>
