If you look at this file, you should find the definitions for WebRequest and subclasses. It looks like the synchronous overloads you are looking for are there, but I'm not sure exactly which ones you want. Regardless, they should be there and if they aren't, it's most likely an accidental omission.

https://github.com/dotnet/standard/blob/master/netstandard/r...

I think that GitHub is either having trouble with how large some of these files are, or just hasn't indexed them yet, since they aren't showing up in the repo search.