By requesting access to user data in context, via incremental authorization, you help users to more easily understand why your application needs the access it is requesting. Specifies any string value that your application uses to maintain state between your authorization request and the authorization server's response.
You can open the URL in the current browser window or a popup.Sometimes, we may have a requirement to open the application developed, to be opened in full screen mode. It will by pass the message prompted “The Web page you are viewing is trying to close the window” Do you want to close this window?To accomplish this, below is the code, in login page, after verifying credentials we redirect user to home page. The OAuth 2.0 API Scopes document contains a full list of scopes that you might use to access Google APIs.The following steps show how your application interacts with Google's OAuth 2.0 server to obtain a user's consent to perform an API request on the user's behalf.For example, an application can use OAuth 2.0 to obtain permission from users to store files in their Google Drives. It is designed for applications that access APIs only while the user is present at the application.These applications are not able to store confidential information.The user can authenticate with Google and grant the requested permissions. The redirect includes an access token, which your app verifies and then uses to make API requests.Note: Given the security implications of getting the implementation correct, we strongly encourage you to use OAuth 2.0 libraries when interacting with Google's OAuth 2.0 endpoints.Any application that uses OAuth 2.0 to access Google APIs must have authorization credentials that identify the application to Google's OAuth 2.0 server.The following steps explain how to create credentials for your project.