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 /

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.

Enes_Afsin_Al

MVP

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.