Siebel IP2016 JavaWebContainer Encoding Problem

Hi, All.

We are trying to use java web container in out Siebel implementation for https outbound web services calls, request method POST.
And we have the problem.
When we are getting cyrillic symbols in a response from 3rd party system - and looks like the servlet replaces it all with question marks, and XML hierarchy converter fails.
But when we are sending cyrillic data in request - it goes ok.

Here are request headers:

user-agent: Mozilla/4.0 accept: text/* soapaction: "updateOp" content-type: text/xml; charset=UTF-8 cache-control: no-cache Pragma: no-cache Host: hostname1Connection: keep-alive Content-Length: 727

Here are response headers

HTTP/1.1 200 OKDate: Wed, 25 Jul 2018 20:53:26 GMTServer: ApacheKeep-Alive: timeout=5, max=100Connection: Keep-AliveTransfer-Encoding: chunkedContent-Type: text/xml;charset=UTF-8