What common mistake do developers make with Redirect responses, why does the mistake cause problems, and what is the safer approach?

What common mistake do developers make with Redirect responses, why does the mistake cause problems, and what is the safer approach? One recurring problem with redirect responses is applying it without understanding the boundary it protects. Always returning status 200 for errors instead of using HTTP status codes that describe the result of the request. In addition, Redirect responses tell the client to request another URL and are common after successful form submissions. Safer engineering approach: keep the responsibility in the correct layer, use the framework's supported API, validate and authorize inputs, avoid hidden side effects, and verify the behavior with tests.