Due to a combination of design errors, bugs, and incorrect documentation, it is surprisingly hard to use .NET's HttpClient correctly. As a result, applications that appear to be working correctly ...

You need to change the way you use HttpClient to keep your application from failing. And, if you're using ASP.NET Core, there's a tool that makes it considerably easier to do the right thing ...

HttpClient: Asynchronous Heaven However, if you are using the .NET Framework version 4.5 or later (and version 4.5 has been out for five years now), then you also have access to the HttpClient object.