janhoy commented on a change in pull request #2472:
URL: https://github.com/apache/lucene-solr/pull/2472#discussion_r648234288



##########
File path: solr/core/src/java/org/apache/solr/handler/IndexFetcher.java
##########
@@ -271,7 +274,34 @@ public IndexFetcher(@SuppressWarnings({"rawtypes"})final 
NamedList initArgs, fin
     String httpBasicAuthPassword = (String) 
initArgs.get(HttpClientUtil.PROP_BASIC_AUTH_PASS);
     myHttpClient = createHttpClient(solrCore, httpBasicAuthUser, 
httpBasicAuthPassword, useExternalCompression);
   }
-  
+
+  private void setLeaderUrl(String leaderUrl) {
+    if (leaderUrl != null) {
+      ShardHandlerFactory shardHandlerFactory = 
solrCore.getCoreContainer().getShardHandlerFactory();
+      if (shardHandlerFactory instanceof HttpShardHandlerFactory) {
+        ZkController zkController = 
solrCore.getCoreContainer().getZkController();
+        ClusterState clusterState = zkController == null ? null : 
zkController.getClusterState();
+        try {
+          ((HttpShardHandlerFactory) 
shardHandlerFactory).getWhitelistHostChecker()
+              .checkWhitelist(clusterState, null, 
Collections.singletonList(leaderUrl));

Review comment:
       Ok, this is for validation of `leaderUrl` in replication handler. In 
SOLR-15340 the setting is renamed to `allowUrls` which better reflects the 
generic intent for it, such as validating any user/config provided URL in the 
system.
   
   As this sounds like a bug, please file a NEW Jira issue with a clear 
description on how to reproduce the issue, including the Exception stacktrace 
you see, so we can get a bug fix in the next bugfix release.




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