From a2563b08c64c813c287fe3f51f18c7e0b1207ff9 Mon Sep 17 00:00:00 2001
From: Jason van Zyl <jason@tesla.io>
Date: Thu, 2 Apr 2015 13:56:41 -0400
Subject: [PATCH] Don't add header if already present

---
 .../apache/maven/repository/legacy/DefaultWagonManager.java   | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/maven-compat/src/main/java/org/apache/maven/repository/legacy/DefaultWagonManager.java b/maven-compat/src/main/java/org/apache/maven/repository/legacy/DefaultWagonManager.java
index 7f91d5391b..2c4a60ec98 100644
--- a/maven-compat/src/main/java/org/apache/maven/repository/legacy/DefaultWagonManager.java
+++ b/maven-compat/src/main/java/org/apache/maven/repository/legacy/DefaultWagonManager.java
@@ -243,11 +243,11 @@ public class DefaultWagonManager
         // See org.eclipse.aether.connector.wagon.WagonRepositoryConnector.connectWagon(Wagon)
         if( legacySupport.getRepositorySession() != null )
         {
-            String userAgent = ConfigUtils.getString( legacySupport.getRepositorySession(), ConfigurationProperties.USER_AGENT );
+            String userAgent = ConfigUtils.getString( legacySupport.getRepositorySession(), null, ConfigurationProperties.USER_AGENT );
             if( userAgent == null)
             {
                 Properties headers = new Properties();
-    
+                    
                 headers.put( "User-Agent", ConfigUtils.getString( legacySupport.getRepositorySession(), "Maven",
                                                                   ConfigurationProperties.USER_AGENT ) );
                 try