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var config = new ConfigurationBuilder()
    .AddJsonFile("appsettings.json")
    .build();

var host = new WebHostBuilder()
    .UseConfiguration(config.GetSection("Hosting"))

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{
    "AppSettings": {
        "Setting1": "value1",
        "Setting2": "value2"
    },
    "Hosting": {
        "urls": "https://*:5000",
        "environment": "Production"
    }
}

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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.

namespace Microsoft.AspNetCore.Hosting
{
    public static class WebHostDefaults
    {
        public static readonly string ApplicationKey = "applicationName";
        public static readonly string StartupAssemblyKey = "startupAssembly";
        

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public static void Main(string[] args)
{
    var config = new ConfigurationBuilder()
        .AddJsonFile("hosting.json", optional: true)
        .AddCommandLine(args)
        .Build();

    var host = new WebHostBuilder()
        .UseConfiguration(config)
        .UseKestrel()

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

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>

  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
    <DefineConstants>TRACE;DEBUG;ASSERT;NETCOREAPP2_0</DefineConstants>
  </PropertyGroup>

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

  <PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
  </PropertyGroup>
  
  <ItemGroup>
    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="15.3.0-preview-20170601-03" />
    <PackageReference Include="Newtonsoft.Json" Version="10.0.2" />
    <PackageReference Include="xunit" Version="2.3.0-beta3-build3705" />