[Django]-Google OAUTH gives 502 error

This likely has to do with your redirect_uri. 502 is a very general error. It indicates that Django (probably uWSGI or Passenger) was unable to get a response before timeout. Have you tried that uri directly in your browser? If you have any HTTP authentication or anything on that domain, it will cause this error. For some reason, the OAuth does not seem to be properly creating the redirect response.

Hope this helps!