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kotlinlang

We separate a repo for the platform API, then have another repo for `common` logic and generate lib for platforms like android and ios. For things like http, I just declare some interface as `expect` class, then add wrapper to the existing system api. So, I use `HttpUrlConnection` on android and `URLSession` on iOS. If the usage gets complex in the future, I might add wrapper to some famous 3rd party libs. But still you need to implement the `expect` class twice for both android and ios.