OAuth in 1C via WinHttp.WinHttpRequest.5.1. How to get URL after redirect?

Question

OAuth

Colleagues, I am engaged in such a ... task.
You need to get an oAuth token from 1C and communicate with the Bitrix24 REST API...
First, you need to get a code. According to the Bitrix documentation, you need to send the following request:

https://XXXXX.bitrix24.ua/oauth/authorize/?client_id=ID_ПРИЛОЖЕНИЯ&response_type=code&http%3A%2F%2FXXXXXXX.XXX

Then the server should redirect us to the URL

http://XXXXXXX.XXX/?code=grprqfh71ogzfa5qb50b2rvwizickqn7&domain=XXXXX.bitrix24.ua&member_id=616c5rb77c856732c8c605eafac8d155

where code=grprqfh71ogzfa5qb50b2rvwizickqn7 is what I need...
If you do it using a browser, then everything is ok..
But I need to do it in 1C, and on the server-side.
Usually, POST requests in this case are sent via WinHttp.WinHttpRequest.5.1 connected as a COM object.
Actually, a question. I send a request, wait for execution and access the URL field of this object. What I see there is not at all what I saw in the URL field of the browser after the redirect.. I tried to access the "Location" header, but there is no such header..
How to get the current URL after the redirect?