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jonathanw84's avatar
jonathanw84
Icon for Cirrus rankCirrus
Jun 03, 2020
Solved

iRule to Add Trailing Slash Except for Extensions

Hello,

I have an iRule that I am using to direct requests to a specific pool based on the URI:

when HTTP_REQUEST {
   set uri [string tolower [HTTP::uri]]
   if {[HTTP::uri] starts_with "/apps"} {
   pool ProxyPass_DEV_pool_2
   }
   else {
   pool ProxyPass_DEV_pool_1
}
}

This is working fine, but I also need to ensure that any request that does not have an trailing slash "/" at the end, gets it added, with the exception of requests that end in an extension. For example: www.website.com/apps would become www.website.com/apps/, but for any URI really.

Additionally, www.website.com/test.html would not be affected.

Any suggestions? Thanks!

application delivery
BIG-IP
iRules
  • cjunior's avatar
    cjunior
    Jun 04, 2020

    Hello,

    Considering that the resource will only have the dot char to extensions, I do this way:

    when HTTP_REQUEST {
    if { not ( [HTTP::path] ends_with "/") && not ( [URI::basename [HTTP::uri]] contains "." ) } {
        # Append slash and keep querystring when it exists
        HTTP::uri [HTTP::path]/[expr { "[URI::query [HTTP::uri]]" eq {} ? {} : "?[URI::query [HTTP::uri]]" }]
    }
    if { [string tolower [HTTP::uri]] starts_with "/apps" } {
        pool ProxyPass_DEV_pool_2
    }
    else {
        pool ProxyPass_DEV_pool_1
    }
}

    Where:

    1. "/apps" will become "/apps/" internally;
    2. "/apps?param=value" will become "/apps/?param=value" internally;
    3. "/test.html" and "/test.html?param=value" remais the same. 

    I hope it helps.

    Regards

4 Replies

  • cjunior's avatar
    cjunior
    Icon for Nacreous rankNacreous
    Jun 04, 2020

    Hello,

    Considering that the resource will only have the dot char to extensions, I do this way:

    when HTTP_REQUEST {
    if { not ( [HTTP::path] ends_with "/") && not ( [URI::basename [HTTP::uri]] contains "." ) } {
        # Append slash and keep querystring when it exists
        HTTP::uri [HTTP::path]/[expr { "[URI::query [HTTP::uri]]" eq {} ? {} : "?[URI::query [HTTP::uri]]" }]
    }
    if { [string tolower [HTTP::uri]] starts_with "/apps" } {
        pool ProxyPass_DEV_pool_2
    }
    else {
        pool ProxyPass_DEV_pool_1
    }
}

    Where:

    1. "/apps" will become "/apps/" internally;
    2. "/apps?param=value" will become "/apps/?param=value" internally;
    3. "/test.html" and "/test.html?param=value" remais the same. 

    I hope it helps.

    Regards

    • jonathanw84's avatar
      jonathanw84
      Icon for Cirrus rankCirrus
      Jun 08, 2020

      Thanks cjunior! This worked well with only one minor issue. It looks like it is appending the / regardless if it the / is there or not. Is there a way to make the statement to say "if not contains "." AND does not end with "/", to add the "/"?

       

      Thanks!

      • cjunior's avatar
        cjunior
        Icon for Nacreous rankNacreous
        Jun 08, 2020

        Ops! That passed by my eyes :/.

        Thank you for warn me.

        I rewrited that condition. Check that out.