<s>
An	O
embedded	B-Protocol
HTTP	I-Protocol
server	I-Protocol
is	O
an	O
HTTP	B-Application
server	I-Application
used	O
in	O
an	O
embedded	B-Architecture
system	I-Architecture
.	O
</s>
<s>
The	O
HTTP	B-Application
server	I-Application
is	O
usually	O
implemented	O
as	O
a	O
software	O
component	O
of	O
an	O
application	B-Application
(	O
embedded	O
)	O
system	O
that	O
controls	O
and/or	O
monitors	O
a	O
machine	O
with	O
mechanical	O
and/or	O
electrical	O
parts	O
.	O
</s>
<s>
The	O
HTTP	B-Application
server	I-Application
implements	O
the	O
HTTP	B-Protocol
protocol	I-Protocol
in	O
order	O
to	O
allow	O
communications	O
with	O
one	O
or	O
more	O
local	O
or	O
remote	O
users	O
using	O
a	O
browser	B-Application
.	O
</s>
<s>
The	O
aim	O
is	O
to	O
let	O
users	O
to	O
interact	O
with	O
information	O
provided	O
by	O
the	O
embedded	B-Architecture
system	I-Architecture
(	O
user	O
interface	O
,	O
data	O
monitoring	O
,	O
data	O
logging	O
,	O
data	O
configuration	O
,	O
etc	O
.	O
)	O
</s>
<s>
via	O
network	B-Architecture
,	O
without	O
using	O
traditional	O
peripherals	O
required	O
for	O
local	O
user	O
interfaces	O
(	O
display	B-Device
,	O
keyboard	B-Device
,	O
etc	O
.	O
</s>
<s>
In	O
some	O
cases	O
the	O
functionalities	O
provided	O
via	O
HTTP	B-Application
server	I-Application
allow	O
also	O
program-to-program	O
communications	O
,	O
e.g.	O
</s>
<s>
Examples	O
of	O
usage	O
within	O
an	O
embedded	O
application	B-Application
might	O
be	O
(	O
e.g.	O
</s>
<s>
to	O
provide	O
a	O
thin	B-Device
client	I-Device
interface	O
for	O
a	O
traditional	O
application	B-Application
;	O
</s>
<s>
to	O
implement	O
a	O
protocol	O
for	O
the	O
distribution	O
and	O
acquisition	O
of	O
information	O
to	O
be	O
displayed	O
in	O
the	O
regular	O
interface	O
—	O
possibly	O
a	O
web	O
service	O
,	O
and	O
possibly	O
using	O
XML	B-Protocol
as	O
the	O
data	B-Application
format	I-Application
;	O
</s>
<s>
to	O
develop	O
a	O
web	B-Application
application	I-Application
.	O
</s>
<s>
There	O
are	O
a	O
few	O
advantages	O
to	O
using	O
HTTP	B-Protocol
to	O
perform	O
the	O
above	O
:	O
</s>
<s>
HTTP	B-Protocol
is	O
a	O
well	O
studied	O
cross-platform	O
protocol	O
and	O
there	O
are	O
mature	O
implementations	O
freely	O
available	O
;	O
</s>
<s>
HTTP	B-Protocol
is	O
seldom	O
blocked	O
by	O
firewalls	B-Application
and	O
intranet	B-General_Concept
routers	B-Protocol
;	O
</s>
<s>
HTTP	B-Application
clients	I-Application
(	O
e.g.	O
</s>
<s>
web	B-Application
browsers	I-Application
)	O
are	O
readily	O
available	O
with	O
all	O
modern	O
computers	O
;	O
</s>
<s>
there	O
is	O
a	O
growing	O
tendency	O
of	O
using	O
embedded	B-Protocol
HTTP	I-Protocol
servers	I-Protocol
in	O
applications	O
that	O
parallels	O
the	O
rising	O
trends	O
of	O
home-networking	O
and	O
ubiquitous	B-Architecture
computing	I-Architecture
.	O
</s>
<s>
Natural	O
limitations	O
of	O
the	O
platforms	O
where	O
an	O
embedded	B-Protocol
HTTP	I-Protocol
server	I-Protocol
runs	O
contribute	O
to	O
the	O
list	O
of	O
the	O
non-functional	O
requirements	O
of	O
the	O
embedded	O
,	O
or	O
more	O
precise	O
,	O
embeddable	O
HTTP	B-Application
server	I-Application
.	O
</s>
<s>
"	O
Small	O
"	O
RAM	B-Architecture
and	O
ROM	B-Device
footprint	O
.	O
</s>
<s>
Minimal	O
CPU	B-Device
utilization	O
.	O
</s>
<s>
Cross	B-Application
compilation	I-Application
support	O
for	O
multiple	O
CPU	B-Device
and	O
operating	B-General_Concept
system	I-General_Concept
combinations	O
.	O
</s>
<s>
Easy	O
integration	O
with	O
an	O
existing	O
application	B-Application
,	O
including	O
static	B-Library
linking	I-Library
with	O
the	O
operating	B-General_Concept
system	I-General_Concept
and	O
application	B-Application
.	O
</s>
<s>
Serving	O
pages	O
from	O
application	B-Application
memory	B-General_Concept
if	O
there	O
is	O
no	O
file	B-Application
system	I-Application
.	O
</s>
<s>
Modularity	B-Architecture
.	O
</s>
<s>
Single	B-Operating_System
thread	I-Operating_System
and	O
multi-thread	B-Operating_System
support	O
.	O
</s>
<s>
For	O
example	O
,	O
ROM	B-Device
and	O
RAM	B-Architecture
footprints	O
can	O
be	O
a	O
very	O
serious	O
constraint	O
and	O
limit	O
the	O
choices	O
of	O
the	O
system	O
designer	O
.	O
</s>
<s>
C++	B-Language
or	O
JVM	B-Language
availability	O
for	O
the	O
system	O
can	O
be	O
another	O
constraint	O
.	O
</s>
<s>
Frequently	O
performance	O
is	O
an	O
issue	O
,	O
because	O
typical	O
embedded	B-Architecture
systems	I-Architecture
run	O
multiple	O
simultaneous	O
tasks	O
and	O
an	O
HTTP	B-Application
server	I-Application
is	O
only	O
one	O
of	O
them	O
and	O
may	O
be	O
configured	O
as	O
a	O
low	O
priority	O
task	B-General_Concept
.	O
</s>
