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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
	}
}

     

CA_Valli's avatar
CA_Valli
Icon for MVP rankMVP
Oct 18, 2023

Well you might as well collect this variable in the SERVER_CONNECTED event ..
If I get it right the purpose of your header will be identify the server in the farm during tshoot - IMHO having the IP address as the header value is a pretty good information for doing that .. so I think the iRule might be as easy as

 

 

when SERVER_CONNECTED {
  set xserveron [IP::server_addr]
}
when HTTP_REQUEST_SEND {
  clientside { HTTP::header insert "X-Server-On" "$xserveron" }
}