How to Handle 302 Redirects from SSO Servers and Avoid CORS Errors in ReactJS?

ReactJS GET Request Redirected with 302, Encountering CORS Error

In ReactJS development environments, authenticating users through Single Sign-On (SSO) can present challenges when the backend responds with a 302 redirect. Let's explore the scenario and find a solution to overcome the CORS error.

Scenario:

• Frontend server: ReactJS application running on f.com
• Backend server: Golang API running on b.com
• SSO server: sso.example.com

Issue:

ReactJS sends a GET request to b.com/users. The backend responds with an HTTP 302 redirect to the SSO page at sso.example.com/login. However, the ReactJS app encounters a CORS error from sso.example.com, which blocks the redirection.

Solution:

Since you don't have control over the SSO server and cannot modify its response headers, it's best to handle the redirection on the client side in JavaScript. This approach avoids CORS issues:

Option 1: React Router

You can programmatically navigate using React Router to handle the redirection on the client side. However, this method is more complex.

Option 2: Window.location.href

For a simpler and direct approach, you can use the window.location.href property to redirect the user to the SSO page:

<code class="javascript">window.location.href = "https://www.example.com";</code>

Note: This method may have implications for browsing history.

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