FYI if you want to hack on Instagram's internal APIs, the Android app is much easier to get at. It uses something called "proxygen" for the HTTP client. It's written in C++, which means JNI bindings, which means that part is necessarily excluded from obfuscation. You can hook your own code into it quite easily. I did that years ago to strip ads from API responses before handing them off to the rest of the app.