Can someone please tell me if it is possible to achieve the scenario I am trying to accomplish using iRule?
We are currently using a SaaS-based application which has a weird URL and it is not easy to remember (e.g. https://214124124.sdsddasd.com:10020). What I am looking to achieve is that when a user enters the URL https://mytestsite, it should be able to redirect to the SaaS-based application without changing the URL in the address bar. It should stay mytestsite.
Yes. You don't need to give port in client URL, users can access https://mytestsite. I hope you own the domain for mytestsite and VIP for it is configured on your F5. You would need to create a fqdn pool for the destination "214124124.sdsddasd.com" , port 10020 and map this to the mystestsite VIP. F5 will do the port translation. Use proxypass iRule mentioned in the above discussion to rewrite HOST header. Hope this helps.