If-None-Match and If-Modified-Since headers are removed from request to ASP.NET Core WebApi

[Liero]

Forwarding an issue from here: https://github.com/dotnet/aspnetcore/issues/39516 and here: https://github.com/dotnet/aspnetcore/issues/36291

Basically, BrowserLink removes the headers from all requests, which makes usage of etag and last-modified impossible to test locally.