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accessing ports numbers internally

I need to be able to test access to certain applications (ports) from external to inside. The application will be available via url which translate internally. How though, can I test a certain application (or port it will use) on a server without installing the application? http would be easy since all that is needed is to create a website on a app server, but what about https or another port that the app needs?
Would I use a free certificate for the https?
Also, for an application that uses for example port 1234. how would I be able to test that the url being accessed from outside would reach its destination internally using that port number without installing the 3rd part application on the web server?

url>>>firewall nat>>>internal webserver listening on port 1234
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donnk

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Thanks, I was thinking telnet as well and was just curious if there was anything else.
Would I create a different website under the default website for each port number required. I would be using IIS 7. Thanks for the info on the get command - get / http/1.0.