diff --git a/app/init.php b/app/init.php
index 8edaae81fd..3d0e652b6b 100644
--- a/app/init.php
+++ b/app/init.php
@@ -186,7 +186,7 @@ const APP_AUTH_TYPE_ADMIN = 'Admin';
 // Response related
 const MAX_OUTPUT_CHUNK_SIZE = 2 * 1024 * 1024; // 2MB
 // Function headers
-const FUNCTION_ALLOWLIST_HEADERS_REQUEST = ['content-type', 'agent', 'content-length'];
+const FUNCTION_ALLOWLIST_HEADERS_REQUEST = ['content-type', 'agent', 'content-length', 'host'];
 const FUNCTION_ALLOWLIST_HEADERS_RESPONSE = ['content-type', 'content-length'];
 // Usage metrics
 const METRIC_TEAMS = 'teams';