Скачать или смотреть Troubleshooting Spring Boot JWT CORS Issues with Angular 8

A comprehensive guide on resolving CORS issues between Spring Boot backend and Angular 8 frontend when JWT is implemented.
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This video is based on the question https://stackoverflow.com/q/63158055/ asked by the user 'Anamik Adhikary' ( https://stackoverflow.com/u/2586930/ ) and on the answer https://stackoverflow.com/a/63159947/ provided by the user 'silentsudo' ( https://stackoverflow.com/u/1752366/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting Spring Boot JWT CORS Issues with Angular 8

If you're developing a web application using Spring Boot for the backend and Angular 8 for the frontend, you may encounter a frustrating issue with Cross-Origin Resource Sharing (CORS) when attempting to make API calls. One common problem is that while you may successfully log in and access public APIs, your attempts to access protected routes return CORS errors.

Understanding the Problem

The Scenario

You have set up a Spring Boot application with JWT authentication and configured it to manage CORS requests. However, when you try to access any protected routes, you receive an error message similar to:

[[See Video to Reveal this Text or Code Snippet]]

The Typical Setup

You might have your Spring Boot application configured like this:

Web Security Setup: Created to handle JWT-based authentication.

CORS Configuration: Set to allow requests from the Angular application running on http://localhost:4200.

Despite this setup, the error indicates that the CORS policy is interfering when trying to access protected API routes.

Solution Overview

To resolve the CORS issue, you'll need to ensure that your Spring Security configuration allows CORS requests properly. This involves updating the configuration within your Web Security class.

Steps to Fix CORS Issues

Update the HttpSecurity Configuration: You need to make sure that your HttpSecurity configuration enables CORS handling.

Here’s how to adjust your WebSecurityConfig class:

[[See Video to Reveal this Text or Code Snippet]]

Additional Notes

Ensure that the CORS configuration is included at the beginning of your security chain.

Disabling CSRF may be acceptable for stateless APIs but evaluate its impact based on your application’s needs.

Conclusion

CORS issues can hinder the development process, especially when dealing with authentication and protected routes. By ensuring that your Spring Security configuration allows CORS, you can resolve these frustrating errors and facilitate smooth communication between your Spring Boot backend and Angular 8 frontend.

If you continue to face difficulties, consider revisiting your CORS settings, checking for other middleware that might affect CORS, and consulting official documentation for any updates regarding your tools.

Utilize this guide as a checklist to troubleshoot your application effectively, allowing you to focus on building amazing features without getting bogged down by configuration hurdles.