Get google people profile API does not return birthday and gender key values

GPPSignIn *signIn;

In my iOS app I am setting scope as:

signIn.scopes = @[@"https://www.googleapis.com/auth/plus.login",
                  @"https://www.googleapis.com/auth/plus.me",
                  @"https://www.googleapis.com/auth/plus.profile.emails.read", 
                  @"email",
                  @"profile",
                  @"https://www.googleapis.com/auth/user.birthday.read"];

Also,

signIn.shouldFetchGoogleUserEmail = YES;
signIn.shouldFetchGooglePlusUser = YES;

And trying to get access_token from Google. which I get and send to server.

Now, my server is doing this:

client = OAuth2::Client.new('app_id', 'app_secret')
access_token = OAuth2::AccessToken.new(client, access_token)
profile_api_url = 'https://www.googleapis.com/plus/v1/people/me'
response = access_token.get(profile_api_url)
google_profile_res_body = JSON.parse(response.body)

Here, google_profile_res_body is having many properties but not birthday and gender.

Anyone have any idea? Please suggest. Thanks in advance.

Cheers, Rahul