UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:60.0) Gecko/20100101 Firefox/60.0

Steps to reproduce the problem:
Navigate to website when proxy with authentication is  configured.

What is the expected behavior?
According to https://developer.chrome.com/extensions/webRequest the events should be:

BeforeRequest
BeforeSendHeaders
SendHeaders
HeadersReceived
AuthRequired
*BeforeSendHeaders*
*SendHeaders*
*HeadersReceived*
ResponseStarted
Completed

What went wrong?
The marked events are not received at all.
The order is:

BeforeRequest
BeforeSendHeaders
SendHeaders
HeadersReceived
AuthRequired
ResponseStarted
Completed

https://imgur.com/a/CG3stLS

Did this work before? N/A 

Does this work in other browsers? N/A

Chrome version: 66  Channel: n/a
OS Version: 10.0
Flash Version: Shockwave Flash 29.0 r0

If this is a new Chrome behavior, then please update the documentation.
 

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