madrob commented on code in PR #2927:
URL: https://github.com/apache/solr/pull/2927#discussion_r1913952760


##########
solr/solrj/src/java/org/apache/solr/client/solrj/impl/HttpJdkSolrClient.java:
##########
@@ -73,7 +74,7 @@ public class HttpJdkSolrClient extends HttpSolrClientBase {
   private static final Logger log = 
LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());
 
   private static final String USER_AGENT =
-      "Solr[" + MethodHandles.lookup().lookupClass().getName() + "] 1.0";
+      "Solr[" + MethodHandles.lookup().lookupClass().getName() + "] " + 
SolrVersion.LATEST_STRING;

Review Comment:
   It's ok to lose the distinction in version number because we still have v1 
and v2 clients in the class names?



##########
solr/core/src/java/org/apache/solr/servlet/HttpSolrCall.java:
##########
@@ -1170,6 +1171,21 @@ protected Object _getHandler() {
     return handler;
   }
 
+  /** Gets the client (user-agent) SolrJ version, or null if isn't SolrJ. */
+  public SolrVersion getUserAgentSolrVersion() {
+    String header = req.getHeader("User-Agent");
+    if (header == null || !header.startsWith("Solr")) {
+      return null;
+    }
+    try {
+      return SolrVersion.valueOf(header.substring(header.lastIndexOf(' ') + 
1));

Review Comment:
   If this gets an older client it will return 1.0 or 2.0, which can be 
somewhat misleading.



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