Microsoft.AspNet.WebApi.Client vs System.Net.Http: What are the differences?

Microsoft.AspNet.WebApi.Client: This package adds support for formatting and content negotiation to System.Net.Http. This package adds support for formatting and content negotiation to System.Net.Http. It includes support for JSON, XML, and form URL encoded data; System.Net.Http: Provides a programming interface for modern HTTP applications. Provides a programming interface for modern HTTP applications, including HTTP client components that allow applications to consume web services over HTTP and HTTP components that can be used by both clients and servers for parsing HTTP headers. Commonly Used Types: System.Net.Http.HttpResponseMessage System.Net.Http.DelegatingHandler System.Net.Http.HttpRequestException System.Net.Http.HttpClient System.Net.Http.MultipartContent System.Net.Http.Headers.HttpContentHeaders System.Net.Http.HttpClientHandler System.Net.Http.StreamContent System.Net.Http.FormUrlEncodedContent System.Net.Http.HttpMessageHandler When using NuGet 3.x this package requires at least version 3.4.

Microsoft.AspNet.WebApi.Client and System.Net.Http belong to "NuGet Packages" category of the tech stack.