Err_too_many_redirects spring security

Explanation of err_too_many_redirects in Spring Security

The “err_too_many_redirects” error in Spring Security occurs when there is an infinite loop of redirects happening in your application. This usually happens when the configuration or implementation of Spring Security has a misconfiguration that causes the requests to be redirected in an endless loop.

To understand this error in more detail, let’s consider an example scenario. Suppose you have a Spring Security configuration where you want to redirect users to a login page if they are not authenticated. You may have something like this in your configuration:

    
      protected void configure(HttpSecurity http) throws Exception {
          http
              .authorizeRequests()
                  .anyRequest().authenticated()
              .and()
              .formLogin()
                  .loginPage("/login") // Redirect to login page
                  .permitAll();
      }
    
  

In the above example, if a user tries to access a protected resource without authentication, Spring Security will redirect them to the “/login” page. However, if there is an issue with the configuration or implementation, it may result in an infinite loop of redirects between the protected resource and the login page. This loop of redirects triggers the “err_too_many_redirects” error in the browser.

To fix this error, you need to carefully inspect your Spring Security configuration and implementation. Here are a few things to check:

1. Ensure that the URLs and paths defined in your configuration are correct. Make sure the login page URL matches the one specified in the configuration.
2. Verify that you are not accidentally redirecting users back to a protected resource that requires authentication. This can create a loop.
3. Check if there are any custom filters or interceptors in your application that are interfering with the redirect flow. Disable them temporarily to narrow down the cause.
4. Review your custom login logic to see if it is correctly handling authentication and redirecting users to the expected pages.

By carefully examining these areas, you should be able to identify and resolve the “err_too_many_redirects” error in Spring Security.