Go OAuth2 Web Server
http://localhost:8080/oauth2/authorize?client_id=oauth2_client&redirect_uri=http://localhost/callback&response_type=code&state=somestate&scope=read_write
http://localhost:8080/oauth2/authorize?client_id=oauth2_client&redirect_uri=http://localhost/callback&response_type=token&state=somestate&scope=read_write