Are you using php?I mean the MySQL side. Google works good.
I don't know the flow for google sign in but it shouldn't have issues like you are having.
Post and get are essentially the same thing and they go together in php. Are you talking about $_GET and $_POST not having the info you want? Or do you mean you're sending post and get info to google and not getting a response?
Edt, or you mean mysql side of things?
I get the Google sign in and try getting the profile from MySQL. And create one if it doesn't exist.
I am using PHP. I think I will try rolling it into the same php file.