implement gunicorn WSGI

app/__init__.py

@@ -4,6 +4,7 @@ from flask import Flask
 from flask_sqlalchemy import SQLAlchemy
 from flask_migrate import Migrate
 from flask_login import LoginManager
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 
 db = SQLAlchemy()
@@ -22,6 +23,8 @@ def create_app(config_class='config.Config'):
     login_manager.init_app(app)
     login_manager.login_view = 'auth.login'
 
+    app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1, x_port=1)
+
     from app.main import main
     from app.auth import auth