Forum Discussion
funkdaddy_31014
Nimbostratus
NimbostratusCan't remove Pragma header
Having some content caching issues with a client and I'd like to remove the Pragma header in the event that it's messing things up. I have tried the following:
when HTTP_RESPONSE {
log local0. "BEFORE HEADER: Pragma: [HTTP::header Pragma]"
HTTP::header remove "Pragma"
log local0. "AFTER HEADER: Pragma: [HTTP::header Pragma]"
}
But this always ends up with "Pragma: no-cache"
Jan 6 14:14:07 tmm tmm[2083]: Rule pragma_test : BEFORE HEADER: Pragma: no-cache
Jan 6 14:14:07 tmm tmm[2083]: Rule pragma_test : AFTER HEADER: Pragma: no-cache
Replacing the Pragma header works:
when HTTP_RESPONSE {
log local0. "BEFORE HEADER: Pragma: [HTTP::header Pragma]"
HTTP::header replace "Pragma" "foo"
log local0. "AFTER HEADER: Pragma: [HTTP::header Pragma]"
}
Ends up with "Pragma: foo" in the Response Headers.
Jan 6 14:28:10 tmm tmm[2083]: Rule pragma_test : BEFORE HEADER: Pragma: no-cache
Jan 6 14:28:10 tmm tmm[2083]: Rule pragma_test : AFTER HEADER: Pragma: foo
Any ideas?
Ricardo_MarinhoHi,
Why not use:
HTTP::header replace "Pragma" ""
This way you remove header!
Regards,- Chris_Miller
Altostratus
Besides logging, have you done a packet capture to see whether the header is indeed being sent? Just curious whether the logging is correct as I'd expect the header to be removed. 
funkdaddy_31014Thanks for the replies. Indeed I have done a packet capture and the Pragma is not being removed. Replacing with "" works but I was more concerned with understanding why remove doesen't work...
hooleylistCirrostratus
Hi Funkdaddy,
Do you have any modules/features enabled on the virtual server like WAM or RAM cache? If so, they might be affecting Pragma header. Regardless, it would be a good idea to open a case on the issue with F5 Support so they can review your full configuration and logs.
Aaron
