diff --git a/app/__init__.py b/app/__init__.py
index c670e659d..c14a17fea 100644
--- a/app/__init__.py
+++ b/app/__init__.py
@@ -186,6 +186,8 @@ def init_csrf(application):
 
 def init_app(application):
 
+    application.before_request(request_helper.check_proxy_header_before_request)
+
     @application.before_request
     def record_start_time():
         g.start = monotonic()