Forum Discussion

Hendel's avatar
Hendel
Icon for Nimbostratus rankNimbostratus
Jan 31, 2023

Insert header when item added to ramcache

Haven't been in here for a looong time... :-7 Trying to store a header value received from pool member in a new header as that item is added to the ramcache (so it'll be present when that item is su...
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JRahm's avatar
JRahm
Icon for Admin rankAdmin

Hi Hendel, I haven't done much with the cache in iRules, but your format for setting appears to be correct. That said, can you post a sanitized version of your iRule and whether you have any other iRules or policies that might be interfering? How are you validating that it is not working? Could use CACHE::trace to see if anything is at least being set by the system before hitting a tcpdump on the wire.

Hendel's avatar
Hendel
Icon for Nimbostratus rankNimbostratus
Feb 08, 2023

I'm able to log CACHE::headers when I retrieve objects from the cache, it's just that they only come out with all of their original headers/values as sent by the pool member, not the ones I was trying to insert and/or modify as they went in to the cache.

  • John_Alam's avatar
    John_Alam
    Icon for Employee rankEmployee
    Feb 08, 2023

    i used this version and was able to change the headers Cache-Control.  I was also able to insert headers.  No dynamic values though.

     

    when CACHE_UPDATE {
    CACHE::header insert X-LTM-Cached "test"
    CACHE::header replace Cache-Control "private"
    log local0. "Cache update- path:$path cache: [CACHE::headers]"
}

     

    But you have to invalidate the cache before every expected change of behavior.  You do that from the CLI with this command:  

     

    tmsh delete /ltm profile ramcache optimized-caching

     

     and reload page twice.  First reload will not have the cached version.

    HTH