What is the meaning of the error "redirect_uri_mismatch" in Google OAuth 2 authorization, which results in an Error 400?

edit

The error "redirecturimismatch" in Google OAuth 2 authorization implies that the redirect URI that was given in the request doesn't match the redirect URI that was registered with Google. This might occur when the redirect URI parameter isn't present in the request, isn't present in the right format, or isn't on the list of authorized redirect URIs. A typical cause could be a discrepancy in the configuration settings between the application and the Google API console.