What is the best way to determine whether to use HTTP or HTTPS based on the current URL?

I have a specific line of code in my program that sets the REST URL:

this._restUrl = "http://" + this._info.host + "/app/rest/"; 

However, I am facing an issue when trying to implement SSL. I need help with converting this into a statement that can work with both http and https protocols. Currently, it works fine with http.

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