Ever wonder how your app behaves when the APIs it depends on decide to take a coffee break? Or when they throw a tantrum and start rate-limiting like it's going out of style? Enter Dev Proxy, Microsoft's open-source command-line tool that lets you simulate the chaos of real-world API failures—without actually breaking anything (except maybe your assumptions).

In this session, we’ll explore how Dev Proxy intercepts network requests on your dev machine and lets you:

Mock responses without writing throwaway code,
Simulate errors and throttling with a flick of a config file,
Test your app’s resilience when things go sideways (because they will),
Use plugins to extend functionality—including a custom built implementation!

Whether you're building for Microsoft Graph, REST APIs, or just want to see your app squirm under pressure, Dev Proxy helps you test the untestable. Come for the demos, stay for the debugging drama. Your future self (and your users) will thank you.

Well received at Orlando and Boston Code Camps. A lot of unsolicited compliments and people saying they were going to start using it Monday morning!