Custom response header to identify pool member - help

On the same lines,  , sometimes passing server details over header are considered sensitive information's. In that case you'd need to hash them before you insert it.

when HTTP_RESPONSE {
set hash [b64encode [md5 "[IP::server_addr]:[TCP::server_port]"]]    
HTTP::header insert Server "$hash"
}

In case your server is 1.1.1.1:443, the header will have Server: 7NPef5jNbRYGxqSIJ/QBtQ== as hashed information.

To confirm, with below command you can get the hash value.

echo -n '1.1.1.1:443' | openssl dgst -md5 -binary | base64

Note, hashing is one-way function, so this can't be done reverse way to get the IP:443.

Use accordingly.