HttpClient uses sockets in managed code since .NET Core 2.1 which was released in Oct 2018: https://docs.microsoft.com/en-us/dotnet/core/whats-new/dotnet-core-2

HttpClient uses sockets in managed code since .NET Core 2.1 which was released in Oct 2018: https://docs.microsoft.com/en-us/dotnet/core/whats-new/dotnet-core-2-1#sockets-improvements https://docs.microsoft.com/en-us/dotnet/core/whats-new/dotne... There shouldn't be any platform issues unless you're using an even older version or manually forcing it. What bugs in cookie handling did you encounter? This is very widely used code and the team is responsive so if you can document the issues then they can help.