Handling GET Request Redirects and CORS Errors in ReactJS

Encountering a CORS error when a ReactJS application sends a GET request to a server and receives a 302 redirect can be a frustrating problem. The following provides a solution to this issue:

To resolve the CORS error in your scenario, where a ReactJS frontend (f.com) requests the backend server (b.com) at the path '/users' and the backend redirects to the SSO login page (sso.example.com/login), you can employ the following approach:

Client-Side Redirection:

It is more straightforward to handle the redirection on the client side within the browser. This way, CORS issues are avoided since the redirection is made directly to the SSO website URL.

To perform the client-side redirection:

Option 1: Using React Router (Complex)

• Implement the redirection within React using a react router.
• Refer to documentation at: Programmatically navigate using react router V4

Option 2: Using plain JavaScript (Easy)

• Use the window.location.href property to directly redirect the browser.
• Ensure that potential issues with the browser history are handled accordingly.

• Code sample:

  window.location.href = "https://www.example.com";

• More information at: https://appendto.com/2016/04/javascript-redirect-how-to-redirect-a-web-page-with-javascript/

By implementing one of these redirection strategies, you can successfully handle GET request redirects while avoiding CORS errors in your ReactJS application.