问题
Well, since the Other problem(solved) remain unsolved, I was thinking to use POSTMan to do Trial and Error on each steps that the Client library will do.
So I read the Basic steps of Google OAuth2 again, created another OAuth 2 ID at Api Manager > Credentials in Dev Console and ID type is Web Application, and filled them into the POSTMan:
- New tab in POSTMan, then click the Authorization label.
- Choose type as OAuth 2.0 and select "Add token to the url"
- Auth URL: https://accounts.google.com/o/oauth2/v2/auth
- Access Token URL: https://www.googleapis.com/oauth2/v4/token
- Client ID: [the Client ID that I just received]
- Client Secret: [the Client secret that I just received]
- Scope: [empty]
- Grant Type: Authorization Code
- Request access token locally: Selected
- Click "Request Token"
- POSTMan replied me: "Could not complete OAuth2.0 login"
Do I missed something?
(Google redirect URI could be found here)
(API scope could be found here)
回答1:
You get access Token only when a Google User Logs in through the google signin page.
Step 1: Redirect https://accounts.google.com/o/oauth2/auth?client_id=" + GoogleClientID + "&redirect_uri=" + Url.Encode(GoogleRedirectURL) + "&response_type=code&scope=email"
Step 2: Now you are on google signin page and you would enter your google credentials.
Step 3 : Google will redirect you back to the redirect_uri that you have configured in the Google Developer Console and you can get the "code" from the QueryString
Step 4: Now you post a form to https://www.googleapis.com/oauth2/v4/token with client_id, client_secret, redirect_uri, code(you obtained in Step 3), and the grant_type=authorization_code
Result: You should now receive the access_token from Google
回答2:
I followed Rajat's instructions, and they worked but afterward I tried what the OP did again but this time setting the scope to 'email' instead of leaving it blank, I got a prompt to enter my gmail creds, and was able to get access token.
回答3:
BigHomie's suggestion of scope to 'email' worked for me as well. But I used a different Auth URL and Access Token URL than BigHomie, because I think it's been updated.
Auth URL: https://accounts.google.com/o/oauth2/auth
Access Token URL: https://accounts.google.com/o/oauth2/token
来源：https://stackoverflow.com/questions/36174558/could-not-obtain-google-oauth-2-token-on-postman