Forum Discussion

Cirrus

Nov 29, 2019

URI Rewrite remove info

How can I remove info from the below URI? Other objects will be called after the numbers so cant just rewrite URI to "/" hxxp://abc.com/1.2.3.4 : remove any IP address after the /

Jan 07, 2020

Hi Curious,

Can you try this iRule?

when HTTP_REQUEST {
    if { [string match {/[0-9]*\.[0-9]*\.[0-9]*\.[0-9]*} [HTTP::uri]] } {
        # log local0. "matchedUri: [HTTP::uri]"
        
        set changedUri [string trimleft [HTTP::uri] "/"]
        # log local0. "changedUri: $changedUri"
        
        if { $changedUri contains "/"} {
            set newUri "[string range $changedUri [string first / $changedUri] end]"
        } else {
            set newUri "/"
        }
        # log local0. "newUri: $newUri"
        
        HTTP::redirect "http://[HTTP::host]$newUri"
    }
}

You can change regex with better expression. I couldn't find exact expression for the IP match.

boneyard

MVP

Nov 30, 2019

use a string replace function, you can find many answers

https://devcentral.f5.com/s/question/0D51T00006i7k6Z/irule-replace-a-part-of-uri

https://devcentral.f5.com/s/articles/irules-101-14-tcl-string-commands-part-2

jaikumar_f5
MVP
Nov 30, 2019
string tcl can look for exact strings, it doesn't act as a regex. The Op is asking for any IP address, not a particular IP address. Would this be still possible ?
- boneyard
  MVP
  Nov 30, 2019
  if you first get the ip address, split on / perhaps you can string replace against that i guess.
  
  also with a other string tricks you can make this work. for example look for first slash, remove (trim) upto that.
  
  and of course you could use regexp as you point out, although the performance impact of that is higher.
- Curious1
  Cirrus
  Jan 07, 2020
  Hey, any further help available on this as it has me beat?
  
  The URLs will change in length as there will be different IP's that need to be removed. No pool will be assigned to the VS and the IP shown in the URL will be used to select a target to connect to. The IP in the URL needs to be removed as this URL will be invalid when requesting the resource on the target.
  
  eg1. hxxp://abc.com/10.4.5.100/path/file (remove the IP and keep anything else)
  eg2. hxxp://abc.com/10.50.100.200/path/file
  
  Any assistance will be really appreciated.