Optimization - avoid dynamic_cast to get Pi-tag for non_internal requests

Author: sudheerv

proxy/ProxyTransaction.cc

@@ -43,10 +43,13 @@ ProxyTransaction::new_transaction(bool from_early_data)
   HttpTxnDebug("[%" PRId64 "] Starting transaction %d using sm [%" PRId64 "]", _proxy_ssn->connection_id(),
                _proxy_ssn->get_transact_count(), _sm->sm_id);
 
-  PluginIdentity *pi = dynamic_cast<PluginIdentity *>(this->get_netvc());
-  if (pi) {
-    _sm->plugin_tag = pi->getPluginTag();
-    _sm->plugin_id  = pi->getPluginId();
+  // PI tag valid only for internal requests
+  if (this->get_netvc()->get_is_internal_request()) {
+    PluginIdentity *pi = dynamic_cast<PluginIdentity *>(this->get_netvc());
+    if (pi) {
+      _sm->plugin_tag = pi->getPluginTag();
+      _sm->plugin_id  = pi->getPluginId();
+    }
   }
 
   this->increment_client_transactions_stat();