Forum Discussion
iRule varibles : per-connection based
I'm trying to write an iRule that has to maintain a set of variables for each TCP connection and has to include those variables as HTTP headers whenever they change.
In the following code, I'm expecting the variable BIGIP_SSL_CIPHER to be persistence per TCP connection; and it's initially passed to the server as HTTP header; and later on it'll be passed only when the value in the received HTTP req is different from the cached value.
when HTTP_REQUEST {
set sslVarModified 0
if { not [info exists BIGIP_SSL_CIPHER] } {
set BIGIP_SSL_CIPHER "[SSL::cipher name]"
set sslVarModified 1
}
if { [info exists BIGIP_SSL_CIPHER] and
[$BIGIP_SSL_CIPHER != [SSL::cipher name] } {
set BIGIP_SSL_CIPHER "[SSL::cipher name]"
set sslVarModified 1
}
if { $sslVarModified } {
HTTP::header replace "BIGIP_SSL_CIPHER" "\$BIGIP_SSL_CIPHER"
}
}
It is not working. What is wrong here ? Any help is greatly appreciated.
- First of all, it's nearly impossible for us to tell what's wrong. Your iRule looks just fine.
My suspicion is that you are actually dealing with a request on a different connection, as many browsers regularly spread requests over multiple connections. I would suggest adding a few log statements both to your HTTP_REQUEST event and to CLIENT_ACCEPTED and log the TCP/IP tuple so you can double check what's going on.
