Error while process req with charset windows-1251

I have a service written in node.js express.js I get http request from another online service. This is header:

{ 
'content-type': 'application/x-www-form-urlencoded; charset=windows-1251',
  host: 'swift-language.info:3030',
  'content-length': '614',
  connection: 'Keep-Alive'
}

body-parser response with 415 error and express doesn't call my route. I guess the problem is charset=windows-1251