What to do with code from Google OAuth 2.0?

Question

Google

I write authorization through Google. I make a request to the site

https://accounts.google.com/o/oauth2/auth?redirect_uri=URL&response_type=code&client_id=CLIENT_ID&scope=https://www.googleapis.com/auth/gmail.readonly

and it redirects to the correct page, with GET requests -

?code=4/бла-бла-бла&scope=https://www.googleapis.com/auth/gmail.readonly

, but I don’t understand what to do with this code, there is no normal information

Answer 1

Further with this code it is necessary to request `access_token`.
Introduction to OAuth 2