8 min readUpdated September 22, 2026
API keys explained
What an API key is, what it proves, why some keys are safe in a browser and others are not, and how to handle one without leaking it.
APIs
Requests, responses, keys, status codes and the traffic between your app and everything else.
9 min readUpdated September 22, 2026
How APIs work in AI-built applications
Requests, responses, headers and status codes — explained through the calls an AI-generated app actually makes, and where those calls tend to go wrong.
6 min readUpdated September 22, 2026
401 vs 403 vs 404 vs 429 vs 500
Five status codes that cover most failures in an AI-built app, what each one is really saying, and who has to fix it.
Looking for something else? Browse every topic.