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Forum Discussion

CraigD1_147916's avatar
CraigD1_147916
Icon for Cirrus rankCirrus
Nov 13, 2015

Please assist with redirect to prepend "www."

Hi, I am hoping someone can review my irule to determine why I get no redirection from it when.   I am attempting to prepend www. in any case where it does not already exist.   Fiddler shows 5...
application delivery
http redirect
iRules
LTM
JRahm's avatar
JRahm
Icon for Admin rankAdmin
Nov 13, 2015

you need to specify the action for both conditions. string tolower is not necessary on the host as it is case insensitive according to the RFC. This should work for you:

when HTTP_REQUEST {
  if { [llength [split [HTTP::host] "."]] < 3 } {
    HTTP::redirect http://www.[HTTP::host][HTTP::uri]
  }
}

This splits the host by the period. If the list is only two items long, then it doesn't have the www before domain.com and redirects.

Example:

% set x "domain.com"
domain.com
% set y "www.domain.com"
www.domain.com
% if { [llength [split $x "."]] < 3 } { puts "prepend" } else { puts "all good" }
prepend
% if { [llength [split $y "."]] < 3 } { puts "prepend" } else { puts "all good" }
all good