Users are not able to edit the web page on web server while traffic passes through the Load Balancer

I am not seeing this URL at all in the not working set up. I think there is something which is not allowing to start the Java Script call to server for this.

did you check in http response? as Kevin mentioned, client has to get that url from somewhere.

I am running 9.3.7 software but the document you shared says that the minimum required software 10.0 or higher.

i understand minimum is 10.0 because it is using static global variable (i.e. static::ext_url). you can put the url in content variable (i.e. no need to use static global variable).

v.10 - A new iRules Namespace by Colin Walker