Tell flask it is behind a proxy

wsgi.py

@@ -1,4 +1,8 @@
 from qlit.server import app
+from werkzeug.middleware.proxy_fix import ProxyFix
 
 if __name__ == "__main__":
-    app.run()
+    app.wsgi_app = ProxyFix(
+        app.wsgi_app, x_for=1, x_proto=1, x_host=1, x_prefix=1
+    )
+    app.run()