Google OAuth token exchange returns invalid_code

Question

I have been implementing the Google web server OAuth flow, but when I attempted to exchange the authorization code with access token, it always complains \"invalid_code\".

Answer 1

The life span of authorization code is only 10 mins,and can only be used one time. So do these checks:

1. Do you use it 10 min later? If so, use it in 10 mins.
2. Have you used it before? If so, obtain a new one and then use it.
3. Is you server time in sync with Google OAuth server's? If not, change your time.