Msg from win curl bad encoding

Hi, I get problem whis send msg to channel from windows curl.

install istruction
use CentOS 7, MySQL
server start and work well. I create webhook for send msg to channel.
but when I try send Cyrillic symbol from windows Curl a get this in channel

I try send same from CentOS curl, and result is ok.
I think problem with encoding request, but dont get where.
any ideas ?

Mattermost Version: 5.13.2
Database Schema Version: 5.13.0
Database: mysql

request I send
contOS curl
curl -i -X POST -H ‘Content-Type: application/json’ -d ‘{“text”: “проверка”}’ http:// myserver/hooks/ibkrg6batpdmingmp48rjydwsy
win curl
curl -X POST -H "Content-Type: text/html; " -d “{“text”: “проверка”}” http:// myserver/hooks/ibkrg6batpdmingmp48rjydwsy
when I send same request with Latin symbols, like “test” work fine.
I try insert type of encoding in request, but this no help
curl -X POST -H “Content-Type: text/html; charset=UTF-8” -d “{“text”: “проверка”}” http:// myserver/hooks/ibkrg6batpdmingmp48rjydwsy

thnks for any respond