Google_Auth_Exception: Error fetching OAuth2 access token, message: 'invalid_request'
google-api-php-client
Solution
I created an oauth2callback.php file and was experiencing this problem. The problem went away when I setup my Google_Client properly. At first I was only setting the clientId and secret. As soon as I set the redirectUri, my code started working. I didn't think I needed to set the redirectUri since I know the redirect had already occurred (I was on the redirect page). I figured this answer might help others experiencing a similar problem.
Problem
I'm trying to get an access token, using the latest version of the google-api-php-client (take a look at this https://github.com/google/google-api-php-client), and I'm following this official doc: https://developers.google.com/api-client-library/php/guide/aaa_oauth2_web The only difference is that I'd like to use the service `Google_Service_Plus`, instead of `Google_Service_Urlshortener`. Basically I do these steps: - I initialize the Google Client `$client` specifying client ID, client secret, developer key, scopes and redirect URI (which points to my localhost Ubuntu 12.04 - PHP 5.3.10). - I initialize the Google Plus Service `$plus` using the Google Client `$client`. - I redirect the user to the Auth URL using `$client->createAuthUrl()`. - The user can see the Consent Page and accepts. - I obtain an authorization code `$_GET['code']` to use for token exchange. - Then, in the callback page, I try to do `$client->authenticate($_GET['code']);` but google server returns HTTP 400 and I get a `Google_Auth_Exception: Error fetching OAuth2 access token, message: 'invalid_request'`. The flow breaks here. What's wrong? Any help will be appreciated. Thanks in advance, Niccolò.