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Michael_Mangret's avatar
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Sep 26, 2006

no-cache irule




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., 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,




3 Replies

  • 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.

  • 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
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      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