Debugging an OAuth2 Authentication Flow with Spring Security - Redirect URI Issues
I'm relatively new to this, so bear with me... This might be a silly question, but This might be a silly question, but While implementing an OAuth2 authentication flow in a Spring Boot application, I've run into a frustrating redirect issue. After successfully authenticating with the external provider, the application fails to redirect back to the specified URI. The expected behavior should be to redirect to `http://localhost:8080/home`, but instead, it keeps looping back to the login page. Here's a snippet of the relevant security configuration in my `SecurityConfig` class: ```java @Configuration @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { @Override protected void configure(HttpSecurity http) throws Exception { http .authorizeRequests() .antMatchers("/login", "/oauth2/**").permitAll() .anyRequest().authenticated() .and() .oauth2Login() .defaultSuccessUrl("/home", true) .failureUrl("/login?error=true"); } } ``` I've double-checked the registered redirect URI in the OAuth2 provider settings, and it matches what’s in my application. Additionally, I've implemented a custom success handler: ```java @Bean public OAuth2LoginSuccessHandler oauth2LoginSuccessHandler() { return new OAuth2LoginSuccessHandler(); } ``` However, logging the redirect URI during the OAuth2 callback shows that it points to an unexpected value, which doesn't match the home endpoint. I suspect that the issue might be related to how the OAuth2 provider is configured or maybe something is off in the way I'm handling the state parameter. To troubleshoot, I enabled debug logging for Spring Security, and I see the following output when the callback is triggered: ``` DEBUG org.springframework.security.web.authentication.AuthenticationSuccessHandler - Redirecting to URI: {actual_uri} ``` This output confirms the application is trying to redirect but to the wrong URI. I've tried clearing the browser cache, and even different browsers, hoping it would resolve a potential caching issue, but the problem persists. Has anyone else experienced similar redirect issues when implementing Spring Security with OAuth2? Any tips on how to ensure the application consistently redirects to the correct URI after authentication would be greatly appreciated! Am I missing something obvious? I'd really appreciate any guidance on this. I'm using Java 3.10 in this project. Any ideas what could be causing this?