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Based on hex.pm current lib has version/tag 1.0.0 at the same time this tag is missed in GitHub.

Should be obvious how to design this, except we need to depend upon cowboy or some other 3rd party HTTP library stack.

Add an optional IP selection handler to the SDK client initialization step which accepts the request context and expects returning an IP.

Add a default handler for this which looks at the X-Forwarded-For header and falls back to the source IP.

The resulting IP is the IP for which details are fetched.

We have several files like eu.json, countries.json, continents.json and so on, which are loaded during initialization / startup of the client.

Instead of loading these as such, which has risks such as the asset not appearing in a production environment properly, and has a performance penalty during init of loading an on-disk file, we should inline the files into a static, in-memory map / dictionary or similar.

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