<s>
HTTP	B-Protocol
header	I-Protocol
injection	I-Protocol
is	O
a	O
general	O
class	O
of	O
web	B-Application
application	I-Application
security	O
vulnerability	O
which	O
occurs	O
when	O
Hypertext	B-Protocol
Transfer	I-Protocol
Protocol	I-Protocol
(	O
HTTP	B-Protocol
)	O
headers	B-Protocol
are	O
dynamically	O
generated	O
based	O
on	O
user	O
input	O
.	O
</s>
<s>
Header	O
injection	O
in	O
HTTP	B-Protocol
responses	O
can	O
allow	O
for	O
HTTP	B-Protocol
response	I-Protocol
splitting	I-Protocol
,	O
session	B-Protocol
fixation	I-Protocol
via	O
the	O
Set-Cookie	O
header	O
,	O
cross-site	O
scripting	O
(	O
XSS	O
)	O
,	O
and	O
malicious	O
redirect	O
attacks	O
via	O
the	O
location	O
header	O
.	O
</s>
<s>
HTTP	B-Protocol
header	I-Protocol
injection	I-Protocol
is	O
a	O
relatively	O
new	O
area	O
for	O
web-based	B-Application
attacks	O
,	O
and	O
has	O
primarily	O
been	O
pioneered	O
by	O
Amit	O
Klein	O
in	O
his	O
work	O
on	O
request/response	O
smuggling/splitting	O
.	O
</s>
