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Insellj's avatar
Insellj
Icon for Altostratus rankAltostratus
Oct 17, 2023

Set Header for Pool items and return it in the Virtual IP (VIP)

Hi, We have a Virtual IP (VIP) setup which load balances requests to a pool of servers. We need to be able to add in a response header depending on which pool server responds. This is so that we can...
application delivery
  • Insellj's avatar
    Insellj
    Oct 18, 2023

    Found a solution 😁  CA_Valli  PSFletchTheTek 

    when HTTP_RESPONSE {
	set xserveron_header_value [class match -value [IP::server_addr] equals webfarm_headers]
	if {$xserveron_header_value ne ""}{
		HTTP::header insert X-Server-On $xserveron_header_value
	}
}

     

PSFletchTheTek's avatar
PSFletchTheTek
Icon for MVP rankMVP

Interested if you get this working, as you normally don't want to let the outside world know about your internal environment. 
But one thought, could your application finger print the responce for you rather than the f5?
Might be worth running a tcpdump on what you have and see if there is something already there you could be looking at,.

Insellj's avatar
Insellj
Icon for Altostratus rankAltostratus
Oct 17, 2023

PSFletchTheTek Thanks for the reply, yeah we are only doing it on an internal web farm. So no outside world to worry about, thank goodness 🤣 Plus I wanted it to be a global thing as there is more than one site being hosted on the pool servers. Would be easy peasy doing it per app, but too many of them to warrent updating them all, unfortunately.

Great idea about the tcpdump, will be a good way to see if it is going the direction I am thinking it is. I will mention you in any solution found if you like 👍