How to insert certificate serial number and ssl verify result to http header both ?

As above, I want to deliver ssl cert serial number to http server behind BIG-IP, and redirect the users who has no cert to an error page at same time.

 

 

It looks like that if I use two "session add ssl" in iRules:

 

 

session add ssl [SSL::sessionid] [X509::verify_cert_error_string [SSL::verify_result]] 180

 

session add ssl [SSL::sessionid] [SSL::cert 0] 180

 

 

the 2nd one will replace the 1st one. How to make the two things valid together?