Java

CORS in Spring Boot looks easy right up until the browser starts throwing vague errors and your API “works in Postman” but fails in Chrome. That’s the normal path. Spring Boot gives you a few different places to configure CORS, and that flexibility is exactly why teams end up with broken preflight requests, duplicated headers, or insecure wildcard rules in production. I’ve seen all three. This guide covers how CORS actually works in a Spring Boot app, when to use each configuration style, and the mistakes that tend to waste the most time. ...