No support for .NET 6 and Blazor.

[toddmanchester]

Would be nice to have this library updated to support .NET 6. With the changes in .NET (6 https://docs.microsoft.com/en-us/dotnet/core/compatibility/networking/6.0/webrequest-deprecated) WebRequest, WebClient no longer work.

[danielwermann]

I have created Pull Request #22 with upgrades to .NET 6.