Fix https github oauth

while using https domian and nginx as proxy, a `ProxyFix` is required.

cps/__init__.py

@@ -36,7 +36,7 @@ from flask_principal import Principal
 from . import logger, cache_buster, cli, config_sql, ub, db, services
 from .reverseproxy import ReverseProxied
 from .server import WebServer
-
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 mimetypes.init()
 mimetypes.add_type('application/xhtml+xml', '.xhtml')
@@ -77,7 +77,7 @@ log = logger.create()
 
 
 def create_app():
-    app.wsgi_app = ReverseProxied(app.wsgi_app)
+    app.wsgi_app = ReverseProxied(ProxyFix(app.wsgi_app, x_for=1, x_host=1))
     # For python2 convert path to unicode
     if sys.version_info < (3, 0):
         app.static_folder = app.static_folder.decode('utf-8')