How to Fix CORS Issues in SpringBoot (with Examples)

Understanding and Resolving CORS Issues in SpringBoot Applications

In this article, we will explain the causes and solutions of CORS (Cross-Origin Resource Sharing) issues in SpringBoot applications.

1. What is CORS?

CORS (Cross-Origin Resource Sharing) is a technique for sharing resources between web applications. Web browsers, by default, follow the Same-Origin Policy for security reasons, restricting resource requests from other domains. CORS is a standard that allows web pages and servers to share resources.

2. Why do CORS issues occur?

When a web application uses Ajax requests to request resources from other domains, if CORS is not separately configured, the browser blocks the request due to the Same-Origin Policy. This prevents the data from being received normally, leading to a CORS issue.

3. How to Resolve CORS Issues in SpringBoot

There are two ways to configure CORS in SpringBoot.

a. Global Configuration:

By implementing the WebMvcConfigurer interface and using the addCorsMappings() method, you can configure CORS for all controllers.

@Configuration
public class WebConfig implements WebMvcConfigurer {
 @Override
 public void addCorsMappings(CorsRegistry registry) {
 registry.addMapping("/**") // Apply CORS configuration to all requests
 .allowedOrigins("*") // Allow all domains
 .allowedMethods("*") // Allow all HTTP methods
 .allowedHeaders("*") // Allow all HTTP headers
 .allowCredentials(true); // Allow cookie processing
 }
}

b. Configuration for Individual Controllers:

By using the @ControllerAdvice and @CrossOrigin annotations, you can configure CORS for individual controller classes or methods.

@RestController
@CrossOrigin(origins = "*", methods = {RequestMethod.GET, RequestMethod.POST})
public class MyController {
 // Write controller method code
}

4. Conclusion

In SpringBoot, you can easily resolve CORS issues using various CORS configuration methods. Depending on the situation, you can use the appropriate method to configure CORS.