Code using HttpConnectionResponseContent for unit testing in a .NET 6 solution

Question

Here is info about our technical development environment :

• .NET 6

• C# 10

• Visual Studio 2022

I’m trying to Mock System.Net.Http.HttpMessageHandler in my mock Unit test code.

Mock<HttpMessageHandler> handlerMock = new Mock<HttpMessageHandler>(MockBehavior.Strict);

       handlerMock
           .Protected()
           // Setup the PROTECTED method to mock
           .Setup<Task<HttpResponseMessage>>(
              "SendAsync",
              ItExpr.IsAny<HttpRequestMessage>(),
              ItExpr.IsAny<CancellationToken>()
           )
        // prepare the expected response of the mocked http call
        .Returns(async (HttpRequestMessage request, CancellationToken token) =>
        {
            HttpResponseMessage response = new HttpResponseMessage();
            response.Headers.Add("Date", "Mon, 17 Apr 2023 14:55:43 GMT");
            response.Headers.Add("Server", "Warp/3.3.23");
            response.Headers.Add("X-Request-ID", "adaf6342-a007-4155-8480-4cd2eacc3a0b");
                               response.Content =  ….fill-in-blank code…….

            response.StatusCode = HttpStatusCode.OK;
            //...decide what to put in the response after looking at the contents of the request

            return response;
        }).Verifiable();

To get more specific, Microsoft.Net.Http.Client package contains the HttpConnectionResponseContent class ( which inherits from HttpContent ).

In the fill-in-blank code area above, I’m trying to implement something like the following code excerpt:

response.Content =  System.Net.Http.HttpConnectionResponseContent(….)

I’ve been searching the internet to find what dll package contains System.Net.Http.HttpConnectionResponseContent API. However, it’s a little strange, I found the following github.com link:

https://github.com/stefanprodan/dockerdash/blob/master/src/Docker.DotNet/Microsoft.Net.Http.Client/HttpConnectionResponseContent.cs

It indicates that the HttpConnectionResponseContent class is part of the Microsoft.Net.Http.Client namespace

However, when I added Microsoft.Net.Http.Client package dll reference to my .NET 6-based solution, it gives the following warning:

Package 'Microsoft.Net.Http 2.2.29' was restored using '.NETFramework,Version=v4.6.1,  
.NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1,   
.NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1'      
instead of the project target framework 'net6.0'. This package may not be fully     compatible  
with your project.

Furthermore, it shows the problem because when I added the namespace, it states that the following namespace does not exist:

using Microsoft.Net.Http;

Could someone please post back code and explain how I can implement something along the following sample code?

response.Content =  System.Net.Http.HttpConnectionResponseContent(….)