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sjy2025's avatar
sjy2025
Icon for Nimbostratus rankNimbostratus
Jul 22, 2025

iRule, Traffic Policy or Re-Write Policy

 

Hi,

I have created an iRule that maps source addresses to a particular pool

when CLIENT_ACCEPTED {
if {[class match [IP::client_addr] equals clients1] } {
     pool POOL_1
   } elseif {[class match [IP::client_addr] equals clients2] } {
     pool POOL_2
   } elseif {[class match [IP::client_addr] equals clients3] } {
     pool POOL_3
   } elseif {[class match [IP::client_addr] equals clients4] } {
     pool POOL_4
   } elseif {[class match [IP::client_addr] equals clients5] } {
     pool POOL_5
   }
   else {
      pool POOL_6
     }
}

I have a re-write policy that changes the uri

https://example.com to https://examples.com/test

 

When the connection completes to the backend servers, they respond with their hostname in the browser.

 

I want to keep https://example.com on the client side but I'm not sure how to achieve this. I thought I could do a response within my re-write policy but this fails.

I then looked at traffic policies but already have an ASM policy attached

 

Should I try and achieve everything under one irule (if so how, might I do this)

  1. It replaces the original uri with a new uri (going to the server)
  2. Have my current source to pool mapping
  3. Replace the server hostname with the original uri https://example.com

Thanks for any pointers

iRules
rewrite
traffic policy

1 Reply

  • Injeyan_Kostas's avatar
    Injeyan_Kostas
    Icon for Nacreous rankNacreous
    Jul 22, 2025

    Hi sjy2025​ 

    the best solution would be to config application use relative paths

    for now you can try this irule, you will need to apply stream profile also

    when CLIENT_ACCEPTED 
{
    STREAM::disable
    if {[class match [IP::client_addr] equals clients1] } 
    {
        pool POOL_1
    } 
    elseif {[class match [IP::client_addr] equals clients2] } 
    {
        pool POOL_2
    } elseif {[class match [IP::client_addr] equals clients3] }
    {
        pool POOL_3
    } elseif {[class match [IP::client_addr] equals clients4] } 
    {
        pool POOL_4
    } elseif {[class match [IP::client_addr] equals clients5] } 
    {
        pool POOL_5
    }
    else {
        pool POOL_6
    }
}


when HTTP_REQUEST 
{
    STREAM::disable
    HTTP::header remove "Accept-Encoding"
    set original_uri [HTTP::uri]
    HTTP::uri "/test${original_uri}"
}

when HTTP_RESPONSE 
{
    STREAM::disable
    if {[HTTP::header exists "Location"]} 
    {
        set loc [HTTP::header "Location"]
        if {[string match "https://examples.com*" $loc]} 
        {
            HTTP::header replace "Location" [string map {"https://examples.com" "https://example.com"} $loc]
        }
    }
    if {[HTTP::header "Content-Type"] contains "text"} 
    {
        STREAM::expression {@https://examples.com@https://example.com@}
        STREAM::enable
    }
}