From 047a9faf5a8e7918b8cc2743f981c39d5ea43e71 Mon Sep 17 00:00:00 2001
From: Urban Fuchs <fuchs@dsb-ccb.net>
Date: Thu, 20 Mar 2025 17:32:01 +0100
Subject: [PATCH] fix issue #5884

---
 .../awssdk/http/apache/internal/utils/ApacheUtils.java       | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/http-clients/apache-client/src/main/java/software/amazon/awssdk/http/apache/internal/utils/ApacheUtils.java b/http-clients/apache-client/src/main/java/software/amazon/awssdk/http/apache/internal/utils/ApacheUtils.java
index e35eca470d53..ceef02b19363 100644
--- a/http-clients/apache-client/src/main/java/software/amazon/awssdk/http/apache/internal/utils/ApacheUtils.java
+++ b/http-clients/apache-client/src/main/java/software/amazon/awssdk/http/apache/internal/utils/ApacheUtils.java
@@ -149,6 +149,11 @@ private static void addPreemptiveAuthenticationProxy(HttpClientContext clientCon
             AuthCache authCache = new BasicAuthCache();
             // Generate BASIC scheme object and add it to the local auth cache
             BasicScheme basicAuth = new BasicScheme();
+            try {
+                basicAuth.processChallenge(new BasicHeader(AUTH.PROXY_AUTH, "BASIC realm=default"));
+            } catch (MalformedChallengeException e) {
+                throw new RuntimeException(e);
+            }
             authCache.put(targetHost, basicAuth);
 
             clientContext.setCredentialsProvider(credsProvider);