Forum Discussion
NimbostratusTrying to replace the header host value if it doesn't match 2 conditions
I am trying to write an irule that will replace the header host value if it does not meet 1 given value or a 2nd given value. I tried the below irule based on info I gathered from various posts but it does not like the syntax. I am using version 13.1.1.2
when HTTP_REQUEST {
if { ([HTTP::header host] not "abc.host.com") or \
([HTTP::header host] not "xyz.host.com") } {
HTTP::header replace Host "abc.host.com"
}
}
If I try to save the above rule, I get this error: 01070151:3: Rule [/Common/rule_abc_host_header_replace] error: /Common/rule_abc_host_header_replace:2: error: [parse error: PARSE syntax 51 syntax\ error\ in\ expression\ \"\ (\[HTTP::header\ host\]\ not\ \"abc.host.com\")\ or\ \\\n\ \ \ \ \ \ \ \ \ (...\":\ looking\ for\ close\ parenthesis][{ ([HTTP::header host] not "abc.host.com") or \
([HTTP::header host] not "xyz.host.com") }]
10 Replies
Vijay_ECirrus
Sorry, edited the previous code snippet. "set" should be used for variable creation.
- pchace
Oh right, I should have know that as well. However it still does not work as it does not like something in the syntax. Also I am not triggering it based on the host. The item that is supposed to trigger the event is if the http header does not have a specific hostname in the header.
- Vijay_E
Based on the error message, it looks like you have an extra ] in the set command.
- Vijay_E
Try:
set HOST [string tolower [HTTP::host]] if { (not ($HOST eq "abc.host.com")) or (not ($HOST eq "xyz.host.com")) } {- pchace
Thanks Vijay,
Let me know if I did something wrong, but I entered the rule like this:
when HTTP_REQUEST {
HOST = [string tolower [HTTP::host]]
if { (not ($HOST eq "abc.host.com")) or
(not ($HOST eq "xyz.host.com")) } {
HTTP::header replace Host "abc.host.com"
}
}
And it gave me this error: 01070151:3: Rule [/Common/rule_header_replace_abc] error: /Common/rule_header_replace_abc:2: error: [undefined procedure: HOST][HOST = [string tolower [HTTP::host]]]
DanS92Wouldn't this work as a Local Traffic Policy configured like this?:
- pchace
I am so accustomed to using irules for everything and I am not real familiar with Local Traffic Policy. However this looks like it will do what I need. I will test it and let you know. Thanks!
- DanS92
I am too... But I’ve spent a good amount of time over the last year converting everything I can from iRules to Local Traffic Policies. Especially iRules that direct certain traffic to certain pools based on hostname, because it shows up much better on the Network Map.
