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Forum Discussion

Don_Noel_23994's avatar
Don_Noel_23994
Icon for Nimbostratus rankNimbostratus
May 10, 2006

HTTP Redirects

I am looking to create an iRule that does redirection based off a class list. Below is a break down of the requirements. There was an earlier attempt to put an iRule together and it is located at th...
application delivery
dev
devops
iRules
Deb_Allen_18's avatar
Deb_Allen_18
Historic F5 Account
May 10, 2006
Hi Don --

I think the "domain" and "findstr" functions might solve both of your dilemmas.

http://devcentral.f5.com/wiki/default.aspx/iRules/domain.html

http://devcentral.f5.com/wiki/default.aspx/iRules/findstr.html

Use domain to extract the last field from the domain name, regardless of the number of subdomains in the name:
 log local0. [domain www.company.co.uk 1]
generates the following output:May 10 15:59:46 tmm tmm[1043]: Rule : uk

Use findstr to extract only the characters following "www." in the hostname:
 log local0. [findstr www.company.co.uk "www." 4]
generates the following output:May 10 15:59:46 tmm tmm[1043]: Rule : company.co.uk

You'll need to wrap the findstr in an appropriate condition so you don't get a null string for names NOT starting w/www.:
 if {[HTTP::host] starts_with "www." }{
   log local0. [findstr www.company.co.uk "www." 4]
 }

peace

/deb