IRULE to restrict a specific url after initiated first session

Hi Saidur900, not tested, but to give an idea, you can use the table command to add a key of your random string to the session table, and then upon any other request, if the key is there, the connection will be dropped. I have an indefinite timer here, but the more random strings you have, the larger your memory footprint will grow over time, so be careful unless you're going to flush the table on occassion. I'd recommend a timeout far less, or at least have an automated process to flush the table. But...it's possible. Again, the code is untested, but should get you started. Note that this assumes the HTTP::path ends with your random string. If not, it will need to be adjusted.

when HTTP_REQUEST priority 500 {
    ### Assumes the random string completes the HTTP path! ###
    if {[string match "/api/info/ms*" [HTTP::path]]} {
        set key [string range $uri 13 end]
        if {[table lookup -- -subtable api_paths $key] != ""} {
            drop
        } else {
            table set -- -subtable api_paths $key 1 indefinite
        }
    }
}