When you click login with google, the redirect uri is being changed from https:// to http://

I checked my parameters to make sure the web.base.url is set to the correct https value.  
I also added a web.base.url.freeze value of True.

I can modify line 74 of addons/auth_oauth/controllers.main.py and explicitly define the url and it works.

redirect = request.params.get('redirect') or 'web'
if not redirect.startswith(('//', 'http://', 'https://')):
    redirect = '%s%s' % (request.httprequest.url_root, redirect[1:] if redirect[0] == '/' else redirect)

We are using nginx.