<s>
mod_gzip	O
is	O
an	O
external	O
extension	O
module	O
for	O
the	O
Apache	B-Application
HTTP	I-Application
Server	I-Application
v1	O
and	O
v2	O
.	O
</s>
<s>
It	O
allows	O
using	O
the	O
Gzip	O
compression	O
method	O
for	O
a	O
significant	O
reduction	O
of	O
the	O
volume	O
of	O
web	O
page	O
content	O
served	O
over	O
the	O
HTTP	B-Protocol
protocol	I-Protocol
.	O
</s>
<s>
mod_gzip	O
can	O
be	O
compiled	O
into	O
Apache	B-Application
as	O
either	O
a	O
static	O
or	O
dynamic	O
module	O
.	O
</s>
<s>
When	O
textual	O
content	O
is	O
compressed	O
using	O
mod_gzip	O
,	O
it	O
should	O
maintain	O
its	O
MIME-type	B-Application
,	O
according	O
to	O
their	O
recommended	O
media	B-Application
type	I-Application
:	O
</s>
<s>
One	O
of	O
the	O
earliest	O
Apache	B-Application
1.3	I-Application
versions	O
introduced	O
some	O
internal	O
function	O
for	O
regular	O
expression	O
evaluation	O
.	O
</s>
<s>
This	O
function	O
is	O
used	O
by	O
mod_gzip	O
(	O
for	O
evaluating	O
the	O
filter	O
rules	O
)	O
,	O
therefore	O
mod_gzip	O
would	O
not	O
work	O
together	O
with	O
Apache	B-Application
1.2.x	O
or	O
earlier	O
versions	O
.	O
</s>
<s>
Compatibility	O
between	O
Apache	O
1.3.x	O
and	O
mod_gzip	O
1.3.y	O
is	O
granted	O
in	O
general	O
:	O
the	O
Apache	B-Application
1.3	I-Application
API	O
does	O
n't	O
change	O
any	O
more	O
,	O
mod_gzip	O
would	O
even	O
work	O
together	O
with	O
very	O
old	O
Apache	B-Application
1.3	I-Application
versions	O
.	O
</s>
<s>
The	O
mod_deflate	O
module	O
is	O
similar	O
to	O
mod_gzip	O
,	O
but	O
usable	O
only	O
with	O
Apache	B-Application
v2	O
.	O
</s>
<s>
Starting	O
with	O
Apache	B-Application
2.0.45	O
,	O
the	O
compression	O
level	O
of	O
mod_deflate	O
is	O
configurable	O
using	O
the	O
DeflateCompressionLevel	O
directive	O
,	O
so	O
this	O
difference	O
disappeared	O
.	O
</s>
<s>
This	O
module	O
implements	O
a	O
gzip	O
compression	O
filter	O
for	O
Apache	B-Application
2.0	O
,	O
providing	O
similar	O
functionality	O
to	O
mod_gzip	O
.	O
</s>
<s>
In	O
PHP	B-Application
similar	O
effect	O
achievable	O
for	O
the	O
output	O
of	O
PHP	B-Application
scripts	I-Application
with	O
:	O
</s>
<s>
zlib.output_compression	O
option	O
in	O
the	O
php.ini	O
file	O
.	O
</s>
<s>
CherryPy	B-Application
offers	O
the	O
Gzip	O
filter	O
,	O
which	O
uses	O
the	O
of	O
Python	O
standard	O
library	O
.	O
</s>
<s>
The	O
mod_gzip	O
module	O
licensed	O
with	O
Apache	B-Application
License	I-Application
.	O
</s>
<s>
Module	O
level	O
content	O
compression	O
for	O
Apache	B-Application
started	O
with	O
mod_gzip	O
,	O
written	O
by	O
Kevin	O
Kiley	O
and	O
Konstantin	O
Balashow	O
in	O
autumn	O
2000	O
,	O
documented	O
by	O
Michael	O
Schröpl	O
,	O
published	O
by	O
(	O
RCI	O
)	O
.	O
</s>
<s>
The	O
developers	O
of	O
the	O
Apache	B-Application
2.0.x	O
servers	O
have	O
included	O
the	O
mod_deflate	O
module	O
in	O
the	O
codebase	O
for	O
the	O
server	O
to	O
perform	O
a	O
similar	O
GZIP-encoding	O
function	O
.	O
</s>
