nginx配置中，将upstream的least_conn修改为ip_hash以保持会话（暂时方案）

src/main/resources/nginx/configs/project_template.conf

@@ -1,5 +1,5 @@
 upstream server_list {
-    least_conn;
+    ip_hash; # todo: 暂时采用该方式保持会话连接
     server ${SPRINGBOOT_FIRST_URL};
     server ${SPRINGBOOT_SECOND_URL};
     server ${SPRINGBOOT_THIRD_URL};