APM Web Portal Access URLs for iRules and SSO

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hey

i am publishing an internal resource using APM. i need to configure SSO and non of the built-ins are suitable for me. i have checked and the application is submitting an HTTP Post to the "/api/account/login" when it starts up. i have configured an iRule that will replace the payload of the JSON and populate it with the username and password of the user. the question is how can i make this iRule only runs on request to the specifix resource. this is the iRule code i am using however i could only match on the specific PATH.

 Collect a request payload
when HTTP_REQUEST {
    
    if {"[HTTP::host][HTTP::path]" eq "/api/account/login"}{
        if {[HTTP::method] eq "POST"}{
             Trigger collection for up to 1MB of data
            if {[HTTP::header "Content-Length"] ne "" && [HTTP::header "Content-Length"] <= 1048576}{
                set content_length [HTTP::header "Content-Length"]
            } else {
                set content_length 1048576
            }
             Check if $content_length is not set to 0
            if { $content_length > 0} {
                HTTP::collect $content_length
            }
        }
    }
}
when HTTP_REQUEST_DATA {
   do stuff with the payload
    set newPayload [HTTP::payload]
    log local0. $newPayload
    set username [ACCESS::session data get "session.custom.username"]
    set password [ACCESS::session data get "session.custom.password"]
    set search1 \"username\":\"\"
    set replace1 \"username\":\"$username\"
    set search2 \"password\":\"\"
    set replace2 \"password\":\"$password\"
    set newPayload [string map [list $search1 $replace1 $search2 $replace2] $newPayload]
    HTTP::payload replace 0 $content_length $newPayload
    log local0. [HTTP::payload]
}

the HTTP::host parameter is "https://domain.com/f5-w-687474703a2f2f3137322e31392e34372e3430$$/app//login" is the "f5-w-687474703a2f2f3137322e31392e34372e3430$$" string is a static one for an application ? can i use it to verify that the request is for the backend application ?