get code from query string OR body
get code from query string OR body

santi81/oauthenticator,minrk/oauthenticator,jupyter/oauthenticator,jupyter/oauthenticator,jupyterhub/oauthenticator,maltevogl/oauthenticator,santi81/oauthenticator,enolfc/oauthenticator,yuvipanda/mwoauthenticator,NickolausDS/oauthenticator,yuvipanda/mwoauthenticator