From ea8eb0fb7800bd071a4a046323e02a96f7757f39 Mon Sep 17 00:00:00 2001
From: Bert Blommers <bblommers@users.noreply.github.com>
Date: Sat, 15 Oct 2022 22:15:20 +0000
Subject: [PATCH] ELBv2 - Add missing header (#5568)

---
 moto/elbv2/models.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/moto/elbv2/models.py b/moto/elbv2/models.py
index 4b8702645..bd7256a7c 100644
--- a/moto/elbv2/models.py
+++ b/moto/elbv2/models.py
@@ -528,6 +528,7 @@ class FakeLoadBalancer(CloudFormationModel):
         "routing.http.preserve_host_header.enabled",
         "routing.http.x_amzn_tls_version_and_cipher_suite.enabled",
         "routing.http.xff_client_port.enabled",
+        "routing.http.xff_header_processing.mode",
         "routing.http2.enabled",
         "waf.fail_open.enabled",
     }