Bad request when trying to access https://graph.facebook.com/me after successful connection

This worked for me up until about a month ago. Here are the steps to reproduce:

1. Create a login provider by using the FB default presets and adding the pub/private keys from developers.facebook.com/apps
2. Go to /user/1/connections and successfully connect with Facebook
3. Go to /admin/structure/oauthconnector/devel, enter http://graph.facebook.com/me as the Endpoint, and select Facebook as the Provider

The response displayed on the screen is:

array(
  'error' => TRUE,
  'error_str' => 'No result, see watchdog.',
)

The error in the logs is

Bad request of http://graph.facebook.com/me: Bad Request

I also tried using https://www.googleapis.com/oauth2/v1/userinfo as the endpoint after a successful Google connection and got the same errors.