I need to make HTTPS requests to a web API from an app but I

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I need to make HTTPS requests to a web API from an app but I have some identity data that I cannot distribute with the binaries for security reasons, so I have to set up a server from which to make the requests.

Problem is I barely know anything about web servers.
How do I handle
>receiving the requests from the clients
>making http requests
>sending back the result

On the client side I have an asynchronous function which fires a callback method once it gets a reply, but right now the function is doing a "sleep_for" a few hundred milliseconds and returning a dummy value.

I'm not asking for a solution I don't want to be spoonfed, all I'm asking is what language or framework should I be using. First thought was Java with Spark.

Scalability doesn't matter, I doubt I'll even get 10 clients making a request at the same time.