Forum Discussion

Michael_Mangret's avatar
Michael_Mangret
Icon for Nimbostratus rankNimbostratus
Sep 26, 2006

no-cache irule

All,

 

 

I am trying to include both PRAGMA:NO-CACHE and CACHE-CONTROL:NO-CACHE to the http response from my LTM. Does anyone know how to get me started in writing something like this into an irule? I have found the following information at devcentral. http://devcentral.f5.com/wiki/default.aspx/iRules.CACHE, not sure if any of this is going to help me accomplish my task. I have also search the irule forum with no success.

 

 

Please advise,

 

 

Mike
application delivery
dev
devops
iRules
  • Joe_Pruitt's avatar
    Joe_Pruitt
    Sep 26, 2006
    It's as simple as adding headers in the response

    when HTTP_RESPONSE {
  HTTP::header insert "PRAGMA" "NO-CACHE"
  HTTP::header insert "CACHE-CONTROL" "NO-CACHE"
}

    For more help with the HTTP::header commands, take a look at the iRules wiki where we document all the methods.

    -Joe
  • Chad_Roberts_21's avatar
    Chad_Roberts_21
    Icon for Nimbostratus rankNimbostratus
    Jan 04, 2007
    I have this exact rule applied to one of our apps (and I've tried adding HTTP::version "1.1" as well), and it works great for the most part... until a user attempts to download a file in IE. I've found a number of sites that talk about problems when downloading files in IE when the CACHE-CONTROL header is present, but I find it hard to believe that this long into the existence of IE it's still just a fact that IE, downloads, and that header cannot ever co-exist. Has anyone else ever run into this?

     

     

    When a user attempts to download a file, the error is something like this:

     

     

    Internet Explorer cannot download [file] from [server host name].

     

     

    Internet Explorer was not able to open this Internet site. The requested site is either unavailable or cannot be found. Please try again later.

     

     

    Any ideas?
    • hannynikawa's avatar
      hannynikawa
      Icon for Nimbostratus rankNimbostratus
      Mar 30, 2022

      Hi Chad,

       

      I amnew to this F5.  I am trying to do the same thing like you adding no cache on the header.  would you mind sharing the iRule that you did for this.

      Thank you

      Hanny