<s>
Nokia	B-Application
Xpress	I-Application
(	O
also	O
called	O
Xpress	B-Application
Browser	I-Application
)	O
was	O
a	O
mobile	B-Application
browser	I-Application
developed	O
by	O
Nokia	O
and	O
supported	O
by	O
Microsoft	O
until	O
the	O
end	O
of	O
2015	O
.	O
</s>
<s>
It	O
came	O
loaded	O
by	O
default	O
with	O
Series	B-Operating_System
40	I-Operating_System
,	O
Asha	B-Operating_System
Platform	I-Operating_System
and	O
Nokia	B-Application
X	I-Application
Software	I-Application
Platform	I-Application
.	O
</s>
<s>
It	O
uses	O
the	O
Gecko	B-Language
rendering	I-Language
engine	I-Language
.	O
</s>
<s>
On	O
Nokia	O
feature	O
phones	O
it	O
was	O
replaced	O
by	O
Opera	O
browser	B-Application
in	O
early	O
2015	O
.	O
</s>
<s>
Nokia	B-Application
Xpress	I-Application
Browser	I-Application
uses	O
intermediate	O
Nokia	O
proxy	B-Application
servers	I-Application
to	O
optimize	O
web	O
pages	O
based	O
on	O
the	O
capabilities	O
and	O
screen	O
size	O
of	O
the	O
device	O
.	O
</s>
<s>
The	O
proxy	B-Application
servers	I-Application
also	O
compress	O
data	O
to	O
reduce	O
data	O
transmission	O
charges	O
for	O
the	O
mobile	O
user	O
.	O
</s>
<s>
The	O
browser	B-Application
was	O
released	O
for	O
Lumia	B-Device
devices	O
in	O
2012	O
.	O
</s>
<s>
Like	O
the	O
Opera	B-Protocol
Mini	I-Protocol
,	O
the	O
Nokia	B-Application
Xpress	I-Application
browser	I-Application
decrypts	O
and	O
compresses	O
HTTPS	B-Protocol
traffic	O
,	O
routing	O
it	O
through	O
Nokia	O
's	O
own	O
servers	O
.	O
</s>
<s>
However	O
,	O
as	O
pointed	O
out	O
by	O
researcher	O
Gaurang	O
K	O
.	O
Pandya	O
,	O
this	O
raises	O
serious	O
privacy	O
concerns	O
,	O
because	O
Nokia	O
is	O
essentially	O
"	O
performing	O
Man	O
In	O
The	O
Middle	O
Attack	O
for	O
sensitive	O
HTTPS	B-Protocol
traffic	O
"	O
and	O
temporarily	O
decrypting	O
user	O
data	O
—	O
which	O
could	O
be	O
sensitive	O
financial	O
information	O
,	O
passwords	O
.	O
</s>
<s>
GigaOm	O
criticized	O
Nokia	O
,	O
which	O
,	O
unlike	O
the	O
Opera	B-Protocol
Mini	I-Protocol
,	O
has	O
failed	O
to	O
make	O
it	O
clear	O
that	O
HTTPS	B-Protocol
traffic	O
will	O
be	O
decrypted	O
during	O
transit	O
.	O
</s>
<s>
It	O
recommended	O
that	O
Nokia	O
learn	O
from	O
Amazon	B-Protocol
's	I-Protocol
Silk	I-Protocol
browser	B-Application
,	O
which	O
leaves	O
HTTPS	B-Protocol
traffic	O
unperturbed	O
.	O
</s>
<s>
Lumia	B-Device
,	O
Nokia	O
311	O
:	O
Mozilla/5.0	O
(	O
Series40	O
;	O
Nokia311/03.81	O
;	O
</s>
