9-3
User
Guide
for
the
Cisco
Application
Networking
Manager
5.2
OL-26572-01
Chapte
r
9
Configuring
Stickiness
Sticky
Types
HTTP
Content
Stickiness
HTTP
content
stickiness
allows
you
to
stick
a
client
to
a
server
based
on
the
content
of
an
HTTP
packet.
You
can
specify
a
beginning
pattern
and
ending
pattern,
the
number
of
bytes
to
parse,
and
an
offset
that
specifies
how
many
bytes
to
ignore
from
the
beginning
of
the
data.
Related
Topics
•
Configuring
Stickiness,
page
9-1
•
Sticky
Types,
page
9-2
•
Sticky
Groups,
page
9-6
•
Sticky
Table,
page
9-6
HTTP
Cookie
Stickiness
Client
cookies
uniquely
identify
clients
to
the
ACE
and
the
servers
that
provide
content.
A
cookie
is
a
small
data
structure
within
the
HTTP
header
that
is
used
by
a
server
to
deliver
data
to
a
web
client
and
request
that
the
client
store
the
information.
In
certain
applications,
the
client
returns
the
information
to
the
server
to
maintain
the
connection
state
or
persistence
between
the
client
and
the
server.
When
the
ACE
examines
a
request
for
content
and
determines
through
policy
matching
that
the
content
is
sticky,
it
examines
any
cookie
or
URL
present
in
the
content
request.
The
ACE
uses
the
information
in
the
cookie
or
URL
to
direct
the
content
request
to
the
appropriate
server.
The
ACE
supports
the
following
types
of
cookie
stickiness:
•
Dynamic
cookie
learning
You
can
configure
the
ACE
to
look
for
a
specific
cookie
name
and
automatically
learn
its
value
either
from
the
client
request
HTTP
header
or
from
the
server
Set-Cookie
message
in
the
server
response.
Dynamic
cookie
learning
is
useful
when
dealing
with
applications
t
hat
store
more
than
just
the
session
ID
or
user
ID
within
the
same
cookie.
Only
very
specific
bytes
of
the
cookie
value
are
relevant
to
stickiness.
By
default,
the
ACE
learns
the
entire
cookie
value.
You
can
optionally
specify
an
offset
and
length
to
instruct
the
ACE
to
learn
only
a
portion
of
the
cookie
value.
Alternatively,
you
can
specify
a
secondary
cookie
value
that
appears
in
the
URL
string
in
the
HTTP
request.
This
option
instructs
the
ACE
to
search
for
(and
eventually
learn
or
stick
to)
the
cookie
in
-
formation
as
part
of
the
URL.
URL
learning
is
useful
with
applications
that
insert
cookie
informa
-
tion
as
pa
rt
of
the
HTTP
URL.
In
some
cases,
you
can
use
this
feature
t
o
work
around
cl
ients
that
reject
cookies.
•
Cookie
insert
The
ACE
inserts
the
cookie
on
behalf
of
the
server
upon
the
return
request,
so
that
the
ACE
can
perform
cookie
st
ickiness
even
when
the
ser
vers
ar
e
not
configured
t
o
set
cookies.
The
cookie
contains
information
that
the
ACE
uses
to
ensure
persistence
to
a
specific
real
server.
Related
Topics
•
Configuring
Stickiness,
page
9-1
•
Sticky
Types,
page
9-2
•
Sticky
Groups,
page
9-6
•
Sticky
Table,
page
9-6
