修改

flowable/src/main/java/com/huyi/flowable/listener/ExecutionCallListener.java

@@ -32,6 +32,7 @@ public class ExecutionCallListener implements ExecutionListener {
         myListener = this;
         myListener.runtimeService = this.runtimeService;
         myListener.meHistoryMapper = this.meHistoryMapper;
+        myListener.httpClient = this.httpClient;
     }
 
     /**