<s>
lighttpd	B-Protocol
(	O
pronounced	O
"	O
lighty	B-Protocol
"	O
)	O
is	O
an	O
open-source	O
web	B-Application
server	I-Application
optimized	O
for	O
speed-critical	O
environments	O
while	O
remaining	O
standards-compliant	O
,	O
secure	O
and	O
flexible	O
.	O
</s>
<s>
It	O
was	O
originally	O
written	O
by	O
Jan	O
Kneschke	O
as	O
a	O
proof-of-concept	O
of	O
the	O
c10k	B-Protocol
problem	I-Protocol
–	O
how	O
to	O
handle	O
10,000	O
connections	O
in	O
parallel	O
on	O
one	O
server	O
,	O
</s>
<s>
The	O
low	O
memory	O
footprint	O
(	O
compared	O
to	O
other	O
web	B-Application
servers	I-Application
)	O
,	O
small	O
CPU	B-General_Concept
load	O
and	O
speed	O
optimizations	O
make	O
lighttpd	B-Protocol
suitable	O
for	O
servers	O
that	O
are	O
suffering	O
load	O
problems	O
,	O
or	O
for	O
serving	O
static	O
media	O
separately	O
from	O
dynamic	O
content	O
.	O
</s>
<s>
lighttpd	B-Protocol
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
and	O
is	O
distributed	O
under	O
the	O
BSD	B-Operating_System
license	I-Operating_System
.	O
</s>
<s>
It	O
runs	O
natively	O
on	O
Unix-like	B-Operating_System
operating	I-Operating_System
systems	I-Operating_System
,	O
as	O
well	O
as	O
Microsoft	B-Application
Windows	I-Application
.	O
</s>
<s>
lighttpd	B-Protocol
supports	O
the	O
FastCGI	O
,	O
SCGI	B-Protocol
and	O
CGI	B-Language
interfaces	O
to	O
external	O
programs	O
,	O
allowing	O
web	O
applications	O
written	O
in	O
any	O
programming	O
language	O
to	O
be	O
used	O
with	O
the	O
server	O
.	O
</s>
<s>
As	O
a	O
particularly	O
popular	O
language	O
,	O
PHP	B-Application
performance	O
has	O
received	O
special	O
attention	O
.	O
</s>
<s>
Lighttpd	B-Protocol
's	O
FastCGI	O
can	O
be	O
configured	O
to	O
support	O
PHP	B-Application
with	O
opcode	B-Language
caches	I-Language
(	O
like	O
APC	O
)	O
properly	O
and	O
efficiently	O
.	O
</s>
<s>
Additionally	O
,	O
it	O
has	O
received	O
attention	O
from	O
its	O
popularity	O
within	O
the	O
Python	B-Language
,	O
Perl	B-Language
,	O
Ruby	B-Language
and	O
Lua	B-Language
communities	O
.	O
</s>
<s>
Lighttpd	B-Protocol
also	O
supports	O
WebDNA	B-Language
,	O
the	O
resilient	O
in-memory	B-General_Concept
database	I-General_Concept
system	I-General_Concept
designed	O
to	O
build	O
database-driven	O
websites	O
.	O
</s>
<s>
It	O
is	O
a	O
popular	O
web	B-Application
server	I-Application
for	O
the	O
Catalyst	B-Language
and	O
Ruby	B-Application
on	I-Application
Rails	I-Application
web	O
frameworks	O
.	O
</s>
<s>
Lighttpd	B-Protocol
does	O
not	O
support	O
ISAPI	B-Library
.	O
</s>
<s>
TLS/SSL	B-Protocol
with	O
SNI	B-Protocol
support	O
,	O
via	O
OpenSSL	B-Language
,	O
GnuTLS	B-Application
,	O
Mbed	B-Language
TLS	I-Language
,	O
NSS	O
,	O
WolfSSL	B-Protocol
.	O
</s>
<s>
Versions	O
below	O
1.4.40	O
do	O
not	O
officially	O
support	O
sending	O
large	O
files	O
from	O
CGI	B-Language
,	O
FastCGI	O
,	O
or	O
proxies	O
unless	O
X-Sendfile	O
is	O
used	O
.	O
</s>
<s>
This	O
limitation	O
has	O
been	O
removed	O
in	O
lighttpd	B-Protocol
1.4.40	O
.	O
</s>
<s>
Lighttpd	B-Protocol
was	O
used	O
in	O
the	O
past	O
by	O
several	O
high-traffic	O
websites	O
,	O
including	O
Bloglines	B-Application
,	O
xkcd	O
,	O
Meebo	B-Protocol
,	O
and	O
YouTube	B-General_Concept
.	I-General_Concept
</s>
<s>
The	O
Wikimedia	O
Foundation	O
also	O
once	O
ran	O
Lighttpd	B-Protocol
servers	O
.	O
</s>
<s>
Due	O
to	O
relatively	O
small	O
size	O
it	O
's	O
often	O
used	O
in	O
embedded	O
devices	O
like	O
GL.iNet	O
and	O
Turris	B-Application
Omnia	I-Application
.	O
</s>
