Zabbix

.......PS. [ZBXNEXT-2475] added handling of compressed content to web monitoring

Merge in ZBX/zabbix from feature/ZBXNEXT-2475-5.5 to master

* commit '4ee8002b716679ab5e0c939c6b518e043106a5d7':
  .......PS. [ZBXNEXT-2475] fixed warning messages
  .......PS. [ZBXNEXT-2475] fixed warnings in PR
  .......PS. [ZBXNEXT-2475] added web monitoring with content encoding