asp.net core serverside prerendering - fetch

Is there a way to configure our own fetch function?

This is needed to for server-side prerendering in ASP.NET core.

Particularly, ASP.NET Core needs to use a fetch that can takes a [relative](https://github.com/aspnet/JavaScriptServices/issues/1187) URL and [self signed certificates](https://github.com/aspnet/JavaScriptServices/issues/1090#issuecomment-313405030)

Here is an implementation of such fetch.

https://github.com/aspnet/JavaScriptServices/blob/dev/src/Microsoft.AspNetCore.SpaServices/npm/domain-task/src/fetch.ts

Thanks