Requests failed while sending 'authorization': 'bearer (token)'

[dxvil]

hi there.
I already tried to use agent option and auth option. i already read all the docs a great many times.
the request will fail if we have the next params:

'Authorization': 'Bearer (jwt token here)',
'Content-Type': 'application/json'

the server side logs said the server waits for some amount of data that was declared in content-length header, but they never come.
we setted the parametr of max-header-size to max, but it doesn't help.
also why i keeping the idea that the problem in proxy, because if i will send the same request directly to server, excluding the cors policy by Access-Control-Allow-Origin header, the request will be 200 OK.
also if we replace the Content-Type by 'plain/text', it will work too.
it seems like a very slick bug, if you know something about please share the knowledge with me.

thank you.