WebSocketsPlayground.csproj

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.Http.Extensions" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.Http.Features" Version="2.2.0" />
    <PackageReference Include="Microsoft.AspNetCore.WebSockets" Version="2.2.0" />
    <PackageReference Include="Microsoft.Net.Http.Headers" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Primitives" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Options" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.DependencyInjection.Abstractions" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.FileProviders.Abstractions" Version="2.2.0" />
    <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="2.2.0" />
  </ItemGroup>

</Project>