From 0abe96239aca8af017107ab89b308394bfeed603 Mon Sep 17 00:00:00 2001
From: Been24 <894661859@qq.com>
Date: Fri, 14 Mar 2025 09:33:21 +0800
Subject: [PATCH] Update developer-guide.adoc

Signed-off-by: Been24 <894661859@qq.com>
---
 .../spring-cloud-gateway-server-webflux/developer-guide.adoc | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/docs/modules/ROOT/pages/spring-cloud-gateway-server-webflux/developer-guide.adoc b/docs/modules/ROOT/pages/spring-cloud-gateway-server-webflux/developer-guide.adoc
index 2ba6507d..709b7551 100644
--- a/docs/modules/ROOT/pages/spring-cloud-gateway-server-webflux/developer-guide.adoc
+++ b/docs/modules/ROOT/pages/spring-cloud-gateway-server-webflux/developer-guide.adoc
@@ -134,8 +134,9 @@ public GlobalFilter customGlobalFilter() {
         .defaultIfEmpty("Default User")
         .map(userName -> {
           //adds header to proxied request
-          exchange.getRequest().mutate().header("CUSTOM-REQUEST-HEADER", userName).build();
-          return exchange;
+          ServerHttpRequest.Builder builder = exchange.getRequest().mutate().header("CUSTOM-REQUEST-HEADER", userName);
+          //use builder to manipulate the request
+          return exchange.mutate().request(builder.build()).build();
         })
         .flatMap(chain::filter);
 }