Debugging iOS apps with Zaproxy

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The other day I was debugging a really nasty bug that happens only in our iOS app. I was really frustrated because I couldn’t figure out why it happens. Everything looks good when debugging the iOS code, but for some reason – the server failed to deserialize the request body. I freaked out – nothing I tried seems to solve the issue. If only there was an easy way to view the actual request and response, maybe I could understand what the issue was…

This is where a proxy comes in handy: A proxy can inspect the traffic and print it an easy to understand manner. There are a lot of available proxies you can use (like Charles (commercial) or Fidler), but OWASP Zaproxy (Zap) is the best open source proxy that I know. Let’s see how easy it is to set it up:

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