How to Fix \'0\' Status Code Errors in Spring Boot AJAX Requests with Spring Security?

How to Resolve CORS Issues with Spring Boot and Spring Security

Configuring CORS (Cross-Origin Resource Sharing) is essential for enabling cross-origin requests in Spring Boot applications. However, when using Spring Security with CORS support, incorrect server responses may occur due to browser restrictions.

Problem:

When executing an AJAX request with both Spring Boot and Spring Security, an XMLHttpRequest object may receive a "0" status code with an empty response body instead of a proper HTTP status code like 401.

Cause:

This issue arises from a conflict between Spring Security's redirect behavior during the authentication process and the lack of CORS headers in the initial request.

Solution:

Spring Security now leverages Spring MVC CORS support. To resolve this issue:

1. Enable Spring Security CORS Support:

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors();
    }
}

2. CORS Global Configuration (Optional):

If desired, you can configure global CORS rules using a CorsConfigurationSource bean:

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.cors().and();
    }

    @Bean
    CorsConfigurationSource corsConfigurationSource() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", new CorsConfiguration().applyPermitDefaultValues());
        return source;
    }
}

By enabling Spring Security CORS support, it will leverage the existing CORS configuration in Spring MVC and ensure that proper CORS headers are added to the responses.

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