Forum Discussion

Dan_Dumont_1403's avatar
Dan_Dumont_1403
Icon for Nimbostratus rankNimbostratus
Dec 20, 2013

Rewriting cache headers before they are used by BigIp

So I have a server behind BigIp that's pretty lame about letting me set cache headers... in short: I can't. So I'd like to try to set the cache headers using an iRule but have them applied before the...
application delivery
devops
ibm
iRules
John_Alam_45640's avatar
John_Alam_45640
Historic F5 Account
Dec 20, 2013

You could add these header to the http response as the server serves them and the bigIP forwards them.

At HTTP_REQUEST you identify the objects, at HTTP_RESPONSE you add the header. THis happens the first time the object is served. After the first time, the cache responds with the object, and HTTP_RESPONSE does not trigger.

when HTTP_REQUEST {
  if { [HTTP::uri] equals "/xyz" } { set insert_hdrs "yes" }
}

when HTTP_RESPONSE {
  if { $insert_hdrs equals "yes" } { HTTP::header insert cache-control value "..." }
}