Why is openid-configuration returning 404 (Spring Authorization Server)?

Are you stuck with the infamous 404 error when trying to access the openid-configuration endpoint in your Spring Authorization Server? Don’t worry, you’re not alone! In this article, we’ll dive into the possible reasons behind this issue and provide you with a step-by-step guide to troubleshoot and resolve it.

What is openid-configuration?

The openid-configuration endpoint is a crucial component of the OpenID Connect (OIDC) protocol, which provides metadata about the authorization server. It’s used by clients to discover the authorization server’s capabilities, such as the available authentication methods, token endpoints, and more. The openid-configuration endpoint is typically accessed via a URL like `https://{authorization-server-url}/.well-known/openid-configuration`.

Why is openid-configuration returning 404?

There are several reasons why the openid-configuration endpoint might return a 404 error. Let’s explore some of the most common causes:

• Misconfigured Authorization Server

  The most common reason for a 404 error is a misconfigured authorization server. Make sure that the OIDC protocol is enabled and the openid-configuration endpoint is correctly configured.

• Invalid URL

  Double-check the URL you’re using to access the openid-configuration endpoint. Ensure that it’s correctly formatted and points to the correct authorization server.

• Firewall or Proxy Issues

  Firewalls or proxies can block the request to the openid-configuration endpoint, resulting in a 404 error. Verify that your network configuration allows access to the authorization server.

• Spring Boot Configuration

  If you’re using Spring Boot, ensure that the OIDC dependencies are correctly configured in your `pom.xml` or `build.gradle` file.

Troubleshooting Steps

Now that we’ve covered the possible causes, let’s go through the troubleshooting steps to resolve the 404 error:

1. Verify the Authorization Server Configuration

   Check the authorization server’s configuration to ensure that OIDC is enabled and the openid-configuration endpoint is correctly configured.

         
         // Spring Authorization Server configuration
         @Configuration
         @EnableAuthorizationServer
         public class OAuth2Config extends AuthorizationServerConfigurerAdapter {
           
           @Override
           public void configure(AuthorizationServerSecurityConfigurer security) throws Exception {
             security.tokenKeyAccess("permitAll()")
               .checkTokenAccess("isAuthenticated()");
           }
           
           @Override
           public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
             endpoints.path("/oauth2/token").tokenEndpointAuthenticationFilter(new TokenEndpointAuthenticationFilter());
           }
         }
         
       

2. Check the URL

   Verify that the URL you’re using to access the openid-configuration endpoint is correct.

         
         // Correct URL
         https://your-authorization-server.com/.well-known/openid-configuration
         
       

3. Verify Network Configuration

   Check your network configuration to ensure that the authorization server is accessible and not blocked by firewalls or proxies.

   Network Configuration	Verify
   Firewall Rules	Allow incoming requests to the authorization server
   Proxy Settings	Ensure the proxy is not blocking the request

4. Check Spring Boot Dependencies

   If you’re using Spring Boot, verify that the OIDC dependencies are correctly configured in your `pom.xml` or `build.gradle` file.

         
         // Maven dependency
         <dependency>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
         </dependency>
         
         // Gradle dependency
         implementation 'org.springframework.boot:spring-boot-starter-oauth2-resource-server'
         
       

Conclusion

By following these troubleshooting steps, you should be able to resolve the 404 error when accessing the openid-configuration endpoint in your Spring Authorization Server. Remember to double-check your authorization server configuration, URL, network configuration, and Spring Boot dependencies.

If you’re still stuck, don’t hesitate to reach out to your dev community or Spring experts for further assistance. Happy coding!

Additional Resources

For further reading and troubleshooting, check out these additional resources:

• Spring Security OAuth2 Documentation
• OpenID Connect Core Specification
• Stack Overflow: Spring Boot OAuth2 Authorization Server openid-configuration endpoint

Remember, troubleshooting is an art, and patience is key. Don’t give up, and you’ll eventually resolve the issue and get your openid-configuration endpoint up and running smoothly!

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