HttpClient

• HttpClient msdn 1
• PowerBI Apiary mock tests 2
• FormUrlEncodedContent 3 response on SO
• Calling a Web API From a .NET Client (C#) 4 2014
• HttpClientExtensions.PostAsJsonAsync 5
• HttpRuntime.Cache and HttpClient.GetAsync: The underlying connection was closed 6
• System.Net.Http.HttpRequestException Error while copying content to a stream 7 on SO
• scalability with ServicePointManager on SO 8

• using Microsoft.AspNetCore.TestHost

  ```cs
    // test class inherits from IDisposable
    //private TestServer _server;
    //private HttpClient _client;
  
    // Arrange
    //var hostBuilder = new WebHostBuilder()
    //   .UseEnvironment("Development")
    //   .UseStartup<esw.Checkout.Api.Startup>()
    //   .CaptureStartupErrors(true);
  
    //_server = new TestServer(hostBuilder);
  
    //_client = _server.CreateClient();
    //_client.BaseAddress = new Uri(hostBuilder.GetSetting("ApiBase"), UriKind.Absolute);
  
      
    #region IDisposable Support
  
    // To detect redundant calls
    //private bool disposedValue = false;
  
    //protected virtual void Dispose(bool disposing)
    //{
    //    if (!disposedValue)
    //    {
    //        if (disposing)
    //        {
    //            _client.Dispose();
    //            _server.Dispose();
    //        }
  
    //        // No unmanaged resources to free => no finalizer
    //        // set large fields to null.
    //        _client = null;
    //        _server = null;
  
    //        disposedValue = true;
    //    }
    //}
  
  
    //// This code added to correctly implement the disposable pattern.
    //public void Dispose()
    //{
    //    Dispose(true);
    //}
  
    #endregion
  ```
  

• C# – Get and send JSON with HttpClient 12, 2025

• System.Net.Http issues

  System.TypeLoadException: Inheritance security rules violated by type: ‘System.Net.Http.WebRequestHandler’. Derived types must either match the security accessibility of the base type or be less accessible. 9

  dependency on a library that uses System.Net.Http 10

  direct dependency on types in System.Net.Http 11

  I had to:

  1. Package Manager Console for ASP.NET Core project over net462

Update-Package System.Net.Http -Version 4.4.0-beta-24913-02 -Source https://dotnet.myget.org/F/dotnet-core

2. Command line for ASP.NET Core project targetting `netcoreapp2.0`, `netstandard2.0`

dotnet remove package System.Net.Http -v 4.3.3
dotnet add package System.Net.Http -v 4.4.0-beta-24913-02

3. For a standard .Net csproj with .NET framework 4.6.2 removed:

<ItemGroup>
    <Reference Include="System.Net.Http">
      <HintPath>..\..\..\..\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.6.2\System.Net.Http.dll</HintPath>
    </Reference>
  </ItemGroup>

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