How to get access token using gmail api

Question

I got the authorization code following this document. But when I tried to get access token, I always got errors. Can anyone help me ?

public String AccessTok         


        

Answer 1

You are not using the right endpoint. Try to change the authURL to https://www.googleapis.com/oauth2/v4/token

From the documentation:

To make this token request, send an HTTP POST request to the /oauth2/v4/token endpoint

The actual request might look like the following:

POST /oauth2/v4/token HTTP/1.1
Host: www.googleapis.com
Content-Type: application/x-www-form-urlencoded

code=4/v6xr77ewYqhvHSyW6UJ1w7jKwAzu&
client_id=8819981768.apps.googleusercontent.com&
client_secret=your_client_secret&
redirect_uri=https://oauth2-login-demo.appspot.com/code&
grant_type=authorization_code

Reference https://developers.google.com/identity/protocols/OAuth2InstalledApp#handlingtheresponse