Instruction manual

Appendix A: Policy Expressions
A-10 NetScaler 9000 Series Installation and Configuration Guide - Volume 1
NSICG60_JAN05
bind filter global block_bad_requests
A.1.2.3 Using Response Side Expressions
By default, all the expressions are evaluated only for requests. In 6.0, the
expressions which can be evaluated at response time are also supported.
To specify the expression which must be evaluated at the response time,
qualifier must be qualified with response flow-type and appropriate protocol
for that qualifier. For example, qualifier RES.HTTP.HEADER should be used
to make use of response http header in expressions. When qualifier is given in
the old format, the default values for flow-type and protocol are taken for that
qualifier. For each qualifier, only certain valid combinations of flow-type and
protocol are accepted, e.g. only REQUEST flow-type and HTTP protocol
combination is valid for URL qualifier, since these are default values too,
qualifiers URL in old format is same as qualifier REQ.HTTP.URL in new
format.
Below table summarizes all the qualifiers with valid values of qualifiers and
their default values:
Figure A-28 Qualifiers with valid values
Qualified as
request
Qualified as
Response
Default
VERSION REQ.HTTP.V
ERSION
RES.HTTP.VERSI
ON
REQ.HTTP.VERSIO
N
METHOD REQ.HTTP.M
ETHOD
No REQ.HTTP.METHO
D