Why is it that while authentication is successful in Insomnia/Post, it fails in the frontend and still redirects to the home page even when no incorrect username or password is entered?

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It is difficult to determine the exact cause of this issue without more information about the backend technology and frontend implementation. However, some possible reasons might include:

1. Session Management: The backend might be maintaining a session, and the frontend might not be preserving it. Hence, when the authentication is successful, the session ID is not transferred to the frontend application, resulting in prompt redirection to the home page.

2. CORS: The backend API might be restricted by CORS policies, and the frontend might not be configured to handle CORS. Hence, even though the authentication is successful, the response from the backend API might be blocked by CORS, leading to redirection to the home page.

3. Error Handling: The frontend might not be handling errors correctly, leading to a redirection to the home page even when the authentication is successful. It is crucial to handle errors in the frontend application correctly and display appropriate error messages to the user.

Overall, it is recommended to debug the backend and frontend applications or seek help from experts to identify and resolve this issue.