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SUBSCRIBE NOWUnderstanding CORS in Spring Boot
If you've ever built a web application where the frontend and backend live on different servers, you've likely run into the dreaded CORS error. In this guide, we'll break down what it is and how to fix it in Spring Boot.
What is CORS?
CORS stands for Cross-Origin Resource Sharing. It is a security feature built into web browsers that prevents a website on one domain from making requests to a different domain unless specifically allowed.
- Same Origin: Same Protocol (http vs https), Same Host, and Same Port.
- Different Origin: If any of these three change, it's a cross-origin request.
How to Enable CORS in Spring Boot
There are three main ways to handle CORS in your Spring Boot projects:
1. Using @CrossOrigin Annotation
The simplest way is to add @CrossOrigin directly to your Controller or specific methods. You can allow all origins using "*" or specify a particular domain.
2. Global Configuration
Instead of adding annotations everywhere, you can define a WebMvcConfigurer bean to handle CORS globally for all your endpoints in one place.
3. Spring Security Integration
If you are using Spring Security, you must also enable CORS within your security configuration so that the filters don't block the pre-flight requests sent by the browser.
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